Hakone Kowakien Yunessun
This hillside complex overlooking Hakone has more than the average onsen. In addition to all the water-based attractions, amenities include a shopping mall modeled on a European outdoor market, a swimsuit rental shop, a massage salon, and a game center. The park is divided into two main zones, called Yunessun and Mori no Yu (Forest Bath). When signing in at reception, get a waterproof digital wristband that allows you to pay for lockers and drink machines within the complex.
In the Yunessun side, where you must wear a swimsuit, you can visit somewhat tacky re-creations of Turkish and ancient Roman baths or take a dip in coffee or red wine. It's all a bit corny, but fun. Younger visitors enjoy the waterslides on Rodeo Mountain. In the more secluded Mori no Yu side, you can go au naturel in a variety of indoor and outdoor, single-sex baths.
