Heated indoor pools and all-season facilities that are less dependent on summer weather. 3 listed · Ad
Kanto · Tochigi · Nasu
Four limited private villas in Nasu Highlands. Every villa has private outdoor pool, private outdoor onsen, and private sauna. Pool is cold water — summer swimming / year-round sauna cool-down (officially not heated).
Okinawa · Okinawa · Kohama Island
Resort hotel villas on Kohama Island with ~12㎡ private terrace pools overlooking Iriomote. Official: temperature-controlled (cool/warm) for year-round use. New Oceanfront Pool Villas open 15 Jul 2026 (bookings already on official site).
Okinawa · Okinawa · Nakijin
Whole-house private villa on a hill overlooking the East China Sea. Private outdoor pool with seamless sauna-to-pool flow (HARVIA electric sauna + cold plunge). Self-catering / BBQ style stay.
| Hotel | Region | Indoor | Year-round | Slide summary | Book Ad |
|---|---|---|---|---|---|
| Bettei Shiki Nasu Tochigi · Nasu | Kanto | — | Yes | Four limited private villas in Nasu Highlands. Every villa has private outdoor pool, private outdoor onsen, and private sauna. Pool is cold water — summer swimming / year-round sauna cool-down (officially not heated). | Compare & book |
| Haimurubushi Oceanfront Pool Villa Okinawa · Kohama Island | Okinawa | — | Yes | Resort hotel villas on Kohama Island with ~12㎡ private terrace pools overlooking Iriomote. Official: temperature-controlled (cool/warm) for year-round use. New Oceanfront Pool Villas open 15 Jul 2026 (bookings already on official site). | Compare & book |
| COCO VILLA Okinawa Nakijin Okinawa · Nakijin | Okinawa | — | Yes | Whole-house private villa on a hill overlooking the East China Sea. Private outdoor pool with seamless sauna-to-pool flow (HARVIA electric sauna + cold plunge). Self-catering / BBQ style stay. | Compare & book |