Kosuge’s hot spring resort (or onsen) is a great way to relax after a day of hiking or completing the Forest Adventure course. It is known for its high alkaline that will make your skin feel smooth. Features include indoor and outdoor baths with Kosuge’s mineral-rich spring water, goemonburo (stone basins suitable for one person), a large open-air barrel tub with weekly rotating herbs such as cypress, a shallow bath for lying down, a waterfall shower with natural spring water, a jacuzzi, and a sauna.
Besides the baths, there are massage chairs, waiting rooms, meeting rooms, nap rooms, a smoking room, vending machines, a restaurant, an art gallery, and a gift shop. Towels are available for rent or purchase.
Kosuge-No-Yu is located next to Michi-No-Eki. From April to October it is open from 10:00-19:00 with last entrance at 18:00. From November to March last entry is at 16:45. It is closed every 4th Friday from April to November, and every Friday from December to March. (Hours subject to change due to events)
Website (Japanese Only): kosugenoyu.jp