Summer in Japan's Highlands With Kids: Cool Air, Indoor Playrooms, and Hot Springs

When you are choosing a summer destination with children, heat is usually the first worry. A long afternoon of outdoor play uses up a child's energy fast, and by the time you get back to the hotel there can be tears. Up in the highlands the air is gentler than on the plains, but mountain weather changes quickly, and rain or fog rolling in after lunch is nothing unusual. That is exactly why a summer highland trip works best when you pick a place that has an indoor playroom and a good bath alongside the outdoor space, so you already have somewhere to retreat to when the weather turns.

Near the Kanto region, the strength is being able to choose hotels where the indoor retreat and the outdoor play space sit on the same grounds. Pension Yamanikki on the Nasu Highlands has a playroom in a separate log cabin stocked with manga and toys, plus a lawn garden lined with handmade play equipment, and its two baths, one large and one small, are booked by each family for private use. At Karuizawa Prince Hotel West you get simple hot spring water and cottages in the woods, along with a fully private nursing booth and stroller rentals, which makes moving around easier when you have a baby and an elementary schooler together.

In Nagano and Yamanashi, the choice comes down to how a hotel combines farm or forest activities with somewhere to spend time indoors. Seisenryo Hotel & Cottage, on the Kiyosato Highlands in the Yatsugatake area, pairs a farm where children can feed Jersey cows with an indoor kids' corner for rainy days. Also on the Kiyosato Highlands, Kids Pension Maple is a small inn with a playroom full of picture books and toys, a lawn garden of about 1,650 square meters, and two family-only private baths. PICA Fujiyoshida offers air-conditioned and heated cottages with mini kitchens, plus a playroom in the front building and an outdoor adventure playground.

In the highlands to the north and the south, choosing around the baths and indoor facilities is what makes a trip weatherproof. Mercure Urabandai Resort & Spa is a forest resort about an 8 minute walk from the Goshiki-numa ponds, with a baby cot and baby soap in the changing room of the hot spring bath, and plans that include dinner, breakfast, and lounge access. In Kyushu, Kamenoi Hotel Aso has ASONIWA, a hands-on kids' park divided into four spaces by age group, and rooms that open directly onto the lawn, while Kirishima Kokusai Hotel has a kids' park with three age-based areas and private baths.

Rental items are limited in number, and age requirements and co-sleeping policies differ from hotel to hotel. Check the verified amenities on the hotel page for anywhere that interests you, then confirm directly with the hotel.