Tanuki-yu is a hot-spring bathhouse in the hills of Ishiki, fed 100% free-flowing from two sources. Its signature is a cave sauna built from local stone, a gentle far-infrared room that warms without harsh heat. There is an open-air bath and two cold baths, large and small, for alternating. A canteen serves local chicken dishes. Open daily 6:00 to 24:00; adult entry ¥460.