Grand Mercure Family Resorts Compared: Nasu vs Awaji vs Okinawa

"I keep hearing Grand Mercure is great for families, but which one is actually right for us?" — that's a question anyone researching family resorts runs into eventually. Even under the same Grand Mercure name, the Nasu, Awaji Island, and Okinawa properties each have a completely different character. Every one of them has a strong selling point, and looking at the brand name alone won't help you decide. This article draws on official information and Rakuten Travel guest ratings (as of June 2026) to organize the material along three axes — age, season, and the main purpose of your trip — so you can judge which one actually fits your family.

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Same brand, completely different substance. Look at age, season, and main purpose, and your choice narrows down to one on its own.

First, where the three properties stand

The quickest way to cut through the confusion is to grasp in one line how these three are actually different from each other. Here's the overview:

All three properties share all-inclusive service (meals, drinks, and some activities included) as a common selling point, but what's actually included, how the rooms are designed, and the location are all completely different. Talking about them side by side purely by brand name tends to end in "that's not what I expected," so deciding on your child's age, the season you're traveling, and your main purpose first is what naturally narrows things down to one.

Getting a feel for the temperature from Rakuten ratings

Another quietly useful piece of decision-making material is the Rakuten Travel guest rating. Lining up the overall rating and review count as of June 2026, all three properties sit consistently in the 4.1-4.2 range.

Awaji Island has the most reviews of the three, which — given the larger base of families traveling with kids — makes it easier to find real-world examples from families with babies. Okinawa has fewer reviews, but that's because it's a relatively new property, having reopened its large pool in 2024; the rating itself is still solidly high. The fact that the scores are so close together means these three properties should be chosen by fit, not by ranking.

Choose between the three by fit, not by ranking. Deciding on age, season, and main purpose first cuts down on indecision.

Nasu Kogen: the richest indoor and outdoor play areas

Of the three properties, Nasu has the strongest "play both outside and inside, no matter what" character. With plenty of play options and a layout that lets a child keep switching to "let's do this next" on their own, it's an especially good fit for a child with energy to burn.

Safari Kids and two play areas

The entire 4th floor at Nasu is a family-only floor, lined with rooms split by age: the animal-themed "Safari Kids," the "Forest Baby" rooms exclusively for ages 0-3 with their own private bath, and Welcome Baby-certified Japanese-Western rooms. Since the room itself doubles as a play space, kids tend to get excited the moment they check in.

The play areas come in two forms: the indoor "NASOBIBA" and the outdoor "NASOBO," whose signature feature is a large slide. The soft-floored area works even for a newborn, while older kids can burn energy on the hills and play equipment. In January 2026, the lounge "KINOHA" was added too, stocked with around 100 picture books and roughly 3,000 comics, rounding out a lineup that holds up even in rain or cold. All of these are free for guests and usable both before check-in and after checkout.

In summer, the outdoor NASOBO officially hosts "Summer Snow Splash," where artificial snow falls for sledding and water-gun play (limited to a few days in July in 2026). Summer reviews suggest it's popular with elementary schoolers too.

The breadth of the all-inclusive plan

Nasu's other strength is how broad its all-inclusive coverage is. The lounge serves food and drinks, including alcohol, so you can take the edge off a child's hunger there before dinner while the adults enjoy a leisurely buffet later in the evening. The buffet features local Nasu Kogen ingredients, and kids' chairs, cutlery, and baby food suited to different ages are all provided. Barely any situation triggers an extra charge, which is reassuring for the household budget too.

One thing to note: it's some distance from Nasu-Shiobara Station, and having a car makes getting around much easier. Train travelers should plan around a taxi (roughly 30 minutes) or a shuttle. Nasu suits families who want to burn off energy indoors and outdoors, especially with kids aged 3-5, families who want to play regardless of season, and families traveling by car.

At Nasu, the rooms and the indoor and outdoor play areas are all included in the room rate. It suits families who don't want the weather to dictate their trip.

Awaji Island: strong age-based rooms and baby facilities

Awaji Island's biggest feature is how finely its room types are split by age. Having the most reviews of the three properties can also be read as evidence of a larger base of families traveling with babies. If you're traveling with a newborn, this is the property that comes up as the first pick.

Baby rooms and kids' rooms

Looking at the official information, the rooms are clearly split in character by age.

There aren't many properties where the room itself is designed this thoroughly around a child's age. Reviews frequently mention things like "our kid didn't want to leave the kids' room" and "we barely needed outside activities." That said, some reviews also note things like "the kids' space felt warm even in winter" or "some of the play equipment was underinflated," so it's realistic to check the condition on the day and use it accordingly.

The equipment that genuinely matters on a trip with a 0-2 year old

For families traveling with a young baby, this equipment translates directly into how much you need to pack. A dedicated diaper trash bin dramatically reduces the odor problem, and a warming pot that doubles as a bottle sterilizer means making formula in the middle of the night can happen entirely in the room. The microwave can reheat baby food, and the ceiling light with a built-in projector is a helpful ally at bedtime. The front desk also lends items like a baby bath chair, a Bumbo seat, and a Type-B stroller. Whether the equipment is already in the room is exactly the kind of thing that changes your peace of mind dramatically.

On top of that, a roughly 460-square-meter parent-and-child lounge called "Shichifuku" opened on the basement floor in January 2026, adding play equipment, a tatami area, and a picture book corner, plus snacks and drinks now included in the room rate. The 1st floor also has a kids' corner with a wooden ball pool and a baby-priority area, making the property one you can fully enjoy without leaving the building even on a rainy day. This one suits families who want to prioritize practicality and convenience over a resort atmosphere, and families who want a layout that lets them play in the room or the building even in rain.

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During the baby stage, "how much you don't have to pack" is the real value of a property. Awaji Island is a clear step ahead on that front.

Okinawa Cape Zanpa: all-in on the largest-class pool in the prefecture

Of the three properties, Okinawa Cape Zanpa is the one that's gone all-in on the pool. Its flagship is the "All Day Pool," enlarged in 2024, and its scale puts it a clear step ahead of the other two.

Four pools and three slides

According to official information, the pool and slide lineup looks like this:

A resort with three different slides is rare even nationwide, and for elementary schoolers it's essentially a theme park. The kids-only "Warabaa Pool" is only about 25cm deep, making it just right for a small child's first taste of water play. That said, the slides do have a height restriction (roughly 110-115cm or taller), so it's worth keeping in mind before booking that what your child can actually ride comes down to height rather than age.

The strength of year-round water play

Reviews of the Okinawa property overwhelmingly focus on the pool, with recurring comments like "you can even play in the heated section in winter" and "our kid was worn out from a full day at the pool." The lazy river and slides run through a heated section, putting this property in a different league from a summer-only pool hotel. Okinawa Cape Zanpa's decisive difference from the other two properties is that water play can be the main purpose of the whole trip. Zanpa Beach right in front of the hotel also offers water-based obstacle courses (age 5 and up, with a guardian) from April to October, so a full day can revolve entirely around the pool and the beach.

One thing to note: rates reportedly tend to run a bit higher than the other two properties, and it gets crowded during the busy summer season. It's about an hour by rental car from Naha Airport, so it's realistic to plan around having a car.

The slides have a height restriction (roughly 110-115cm or taller). What your child can ride comes down to height rather than age, so it's worth checking before booking.

Quick reference: recommendations by child age, and diaper policies

Building on everything above, here's a one-page summary of the top pick by age, plus the easy-to-miss question of whether children still in diapers can use the pool and communal bath. The right property changes depending on your child's age.

Diaper policies differ property by property, so here's only what could be confirmed through each official site's own guidance. At Awaji Island, children still in diapers can use the pool if wearing swim diapers (there's also a section roughly 30cm deep), while the hot spring communal bath requires using a baby bath or baby bath chair. Nasu also allows pool use with swim diapers, and for the communal bath, guides children not yet potty-trained toward the in-room bath or a baby bath. Okinawa's official site, on the other hand, explicitly states that infants in diapers cannot use the communal bath, so families with a baby should plan on using the in-room bath instead. If putting your baby in a hot spring bath matters to you, this is a point worth weighing in advance.

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During the diaper stage, "can they use the communal bath?" is exactly where the properties split. It's reassuring to check the latest official guidance before booking.

Differences in the all-inclusive plan and the seasons

All three properties are all-inclusive, but what's covered differs subtly. Buffet breakfast and dinner, soft drinks and alcohol in the lounge, and light snacks are broadly shared across all three, and being able to spend from morning to night on food and drink without worrying about extra charges is a big reassurance for families. Where they differ is the activity side: Nasu's kids' facilities and Summer Snow Splash, Awaji Island's kids' lounge and pool, and Okinawa's slides and lazy river — the substance of "what play is included for free" is completely different at each property. If you want to compare properties that share this same kind of arrangement, our list of all-inclusive properties is also a useful reference.

The character shifts by season too. Summer is peak season for Okinawa's pool and beach (though rates run higher), while Nasu's appeal in summer is Summer Snow Splash and escaping the heat. Fall brings Nasu's autumn leaves, and winter is dominated by Nasu's access to ski slopes and snow-viewing outdoor baths, while Okinawa shifts to being centered on its heated pool. Awaji Island, thanks to its strong indoor facilities, holds up steadily year-round. The more fixed your travel dates are, the easier it is to narrow down among these three properties by season fit.

Food and drink are largely the same across all three properties. What differs is the substance of the "play included for free."

Summary: if you're still torn, go with this

Finally, here's the shortcut for when you're still undecided:

• Traveling with a baby (0-2) and want to pack light → Awaji Island
• An active 3-5 year old, want to play regardless of weather → Nasu
• Old enough to swim, want to spend the whole day at the pool → Okinawa

Just as the Rakuten ratings sit closely together in the 4.1-4.2 range, there's no ranking among these three properties — only a difference in fit. Match your child's age, the season, and your main purpose, and you're unlikely to go wrong with any of the three as a family trip. It's also interesting that the answer shifts as your child grows — Awaji Island as a newborn, Nasu at ages 3-5, then Okinawa for a slide-filled trip once they're in elementary school. Grand Mercure also has other family-friendly properties in Beppu Bay, Ise-Shima, Minami-Boso, Yatsugatake, and Wakayama Minabe, so if the area you want to visit differs from these three, those are worth considering too.

Frequently Asked Questions

Q1. Can a family with a newborn stay at any of the three properties?

Yes, all three properties accept guests from age 0. That said, for comfort, Awaji Island's baby room is a clear step ahead. Having a warming pot that doubles as a bottle sterilizer, a dedicated diaper trash bin, and a 3-second thermometer right in the room makes a real difference to the burden on families traveling with a young baby. Nasu also has its "Forest Baby" rooms exclusive to ages 0-3, but Awaji Island stands out for how finely the room itself is designed around ages 0-3.

Q2. Can I bring my baby into the hot spring (communal bath)?

Policies differ by property. Nasu and Awaji Island will accommodate children not yet potty-trained, on the condition that a baby bath or baby bath chair is used, but Okinawa Cape Zanpa's official site explicitly states that infants in diapers cannot use the communal bath. If your baby's first hot spring experience matters to you, Awaji Island or Nasu is the safer choice. All three let you use the in-room bath either way.

Q3. Can extra charges come up even with an all-inclusive plan?

Yes, they can. Meals, drinks, and the indoor play areas are basically included, but special activities or seasonally limited experiences can come with an extra fee. Okinawa's slides have a height restriction, and Nasu's Summer Snow Splash only runs on specific dates — some of these come with conditions on "when" and "who" can use them, so it's safest to check the scope and conditions on the official site when booking.

Q4. Which is best for a three-generation family trip?

Going by room size and how well-appointed the in-house lounge is, Awaji Island is a strong candidate — the basement-floor parent-and-child lounge "Shichifuku" works well across generations. Nasu also offers plenty of room choices, and its indoor and outdoor play areas keep the grandchildren's generation from getting bored, which is an advantage. Okinawa is worth recommending too, on the condition that "the grandparents also enjoy water play."

Q5. How do the budgets compare?

Based on the general tone of reviews, Okinawa Cape Zanpa tends to run a bit higher, with Awaji Island and Nasu landing somewhere in the middle. That said, because the all-inclusive plan covers such a broad range, it can end up being relatively good value compared to properties where eating out and activities are billed separately. Rates vary widely by season and room type, so it's essential to check each hotel's official site or Rakuten Travel directly.

Q6. Should I stay 1 night or 2?

All three properties have a large volume of things to do, so 2 nights gives you more breathing room. Okinawa's pool and Nasu's indoor and outdoor play areas and in-room play often can't be fully covered in a single day, so with 2 nights you can pace things out — "pool on day one, take it easy on day two," for example. With just 1 night, you're likely to head home without playing through everything, so 2 nights is the safer bet if your schedule allows it.