Shirakawakogen Country Club

A golf course in the hills of Nishigo, Fukushima, with lodging on site. The big communal bath uses water from the Kashi onsen (甲子温泉) source, and guests tend to use it in the morning or after a round. The grounds look out toward the Nasu mountain range. Whether non-guests can bathe without playing or staying isn't clear, so it's worth calling ahead.