Hakone Kowakien Yunessun
箱根小涌園ユネッサン
- Water slides
- Outdoor pools
- Sauna
- Wellness
Where these facts come from
- Water facts read from yunessun.com
- Operator's site checked Oct 5, 2026 and answering
Hot-spring theme park in Hakone pairing swimsuit water-park baths (wine, coffee, sake) with the traditional Mori no Yu onsen.
About
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.
Water
Prices
| Adult day ticketYunessun (swimsuit area), adults (junior high school age and above), Schedule A (regular price); Schedule B 2,800 yen, Schedule C 3,000 yen. Passport (Yunessun + Mori no Yu) Schedule A 3,500 yen | ≈ €14¥2,500 |
|---|---|
| Child day ticketYunessun (swimsuit area), children (3 years to elementary school), Schedule A; 2 years and under free | ≈ €8¥1,400 |
| Senior day ticketYunessun (swimsuit area), seniors (65 and over) and disability discount, adults, Schedule A (proof required) | ≈ €9¥1,700 |
Source: yunessun.com · Checked Oct 18, 2026 · Euro shown at the ECB rate of Sep 23, 2026
Facilities
Sauna and heat
Treatments and care
Only facilities that are recorded are listed. An absent entry means nobody has recorded it, not that it is missing.
Location
Hakone, Kanagawa
Location data © OpenStreetMap contributors, ODbL.