箱根小涌園ユネッサン

Hakone Kowakien Yunessun is a hot-spring amusement park in the Kowakidani onsen district of Hakone, Kanagawa. It combines the swimsuit-friendly Yunessun spa water park with the traditional nude bathing of Mori no Yu, all fed by natural hot-spring water.

Hot-spring water

The source is a sodium chloride (salt) spring, said to help with neuralgia, muscle and joint pain, poor circulation, fatigue recovery and skin conditions. A gentle 37-39C "warm bath" range is used to relax the body and calm the mind.

Yunessun water park (swimsuit zone)

• Indoor and outdoor areas across Ocean, River, Mountain and Sky themed zones
• Outdoor "Great Fall" waterfall bath and a Rock Cave bath with an aquarium
• Finland outdoor sauna area for families and groups

Novelty baths

• Wine Bath with a 3.6 m wine-bottle centrepiece, promoted as a beauty/rejuvenation bath
• Coffee Bath - Japan's first onsen using cold-brew nel-drip coffee
• Shin Sake Bath - a modern take on a sake bath
• Dr. Fish foot bath

Mori no Yu traditional onsen

A day-use nude onsen (open 11:00-20:00) with indoor and outdoor baths, a sauna and eight private rental baths.

Family attractions & setting

Family-oriented pools, slides and dining make it a full-day destination. Restaurants on site include a food court and teppanyaki, yakiniku and soba venues, and the adjacent Hakone Hotel Kowakien offers overnight stays amid Hakone's mountain scenery.