Yudanaka Onsen 湯田中温泉 — Nagano
In-room bath + reservable private bath
Private SPA Bon is a reservable bath wing of its own — sauna, cold bath and a free-flowing natural spring bath, bookable in two-hour slots, day visitors included. Every room's bath runs on natural onsen too, and the Momoyama bath hall is a registered cultural property.
You get both kinds of private here — a bath of your own, and reservable ones for the long soak. Most guests use both before checkout. You probably will too.
Private-bath and water facts were checked against the property's official site and Japanese booking pages in November 2026. Room plans change — confirm the private bath is included in the plan you book.
More in Yudanaka Onsen
Every guest room's unit bath runs on natural hot spring water here — a Taisho-era source found bubbling up through the riverbed sand — and the shared scenic open-air bath looks over the town.
A small family inn where the hinoki bath is yours alone: write your room number on the board when it's free and lock the door behind you. The water is the inn's own 100% natural spring.
Until 7pm the inn's bath runs on reservations only — pick a 55-minute slot at check-in and the hinoki bath is entirely yours, filled with natural spring water poured straight from the source: no heating, no added water.