Private SPA＆SAUNA U

Private SPA＆SAUNA U sits inside the YUDANAKA BREWERY COMPLEX U in Sano, part of the Shibu Onsen area of Yamanouchi, Nagano. Rather than a shared bathhouse, the whole operation is built around private suites: each room has its own outdoor hot spring bath and sauna, booked by reservation rather than drop-in.

The signature draw is the craft beer spa. The Beer Spa & Sauna plan runs about 9,350 yen per person for three hours, for groups of two to four, and includes a tap pouring one liter of Yudanaka Brewery beer per guest into the bath, a beer-paired löyly sauna session, a beer-infused cold plunge, and a post-sauna drink. A longer Brewery & Beer Spa plan, from roughly 10,850 yen per person, adds a hands-on tour of the working brewery before the same bathing and sauna routine; guests who skip the alcohol get a 1,000 yen discount if they mention it at check-in. There's also a chocolate-themed plan, with a cocoa-scented sauna wrap, a chocolate bath, and a dessert and drink set, priced from 9,350 yen for three hours.

Families and groups are both accommodated, since the rooms are private: parents can soak while kids watch a movie or order from a children's menu, and larger groups get shared space for games and food after their sauna session. Robes (ponchos) are provided, and food and drink can be ordered to the room via mobile ordering during the stay. Parking covers 30 spaces, and the complex is open daily from 10:00 to 18:00.