Sakaeya Ryokan
Hotel SpaShibu Onsen, Nagano
A ryokan in Shibu Onsen with indoor and outdoor hot-spring baths fed by two blended mineral springs, open only to overnight guests.
$$$
3 spas match
Shibu Onsen, Nagano
A ryokan in Shibu Onsen with indoor and outdoor hot-spring baths fed by two blended mineral springs, open only to overnight guests.
Arima Onsen, Hyogo
Hotel spa in Arima Onsen with Arima's rare iron-rich "ginsen" waters, outdoor baths, sauna and jacuzzi, run as an all-inclusive overnight stay.
Atami, Shizuoka
A hotel spa in Atami with a thermal onsen pool, open only to overnight guests staying at Fufu Atami.