Hakone Kowakien Yunessun at Hakone Kowakien Yunessun

Hakone Kowakien Yunessun is a hot spring resort and water park in Hakone, roughly 90 kilometres southwest of Tokyo. The complex operates two zones: an outdoor footbath and traditional onsen area requiring swimwear, and a separate indoor bathing section following conventional Japanese onsen etiquette. The resort sits within the Fuji-Hakone-Izu National Park, and many of its open-air pools face views of the surrounding volcanic landscape.

Visitors can move between themed pools filled with green tea, sake, or coffee, alongside conventional sulphur-rich hot spring baths. The swimwear zone includes water slides and a children's pool area. Entry tickets typically cover access to both zones, with towel rental and locker use available on site. Hakone is accessible from Tokyo via the Odakyu Romancecar or the Tokaido Shinkansen to Odawara, making it a practical day trip from the city.