箱根小涌園ユネッサンはこねしょう涌えんユネッサン
Shared bathing area for all genders
A bathing garment (yuami-gi, 湯浴み着) or swimsuit is required for mixed bathing.
Yunessun is less a traditional onsen and more a swimwear-required hot spring theme park, with themed pools, waterslides, and a wine bath alongside a proper outdoor hot spring area. The konyoku open-air bath here is the swimsuit zone facing the forest. The separate traditional bathhouse keeps the genders apart and operates on standard onsen terms. Good for families with young kids; less so if you came for a quiet soak.
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