Onsen is a Japanese-inspired communal bathhouse with a restaurant at 466 Eddy Street in the Tenderloin, San Francisco. The bathing room holds a redwood sauna, a steam room, a custom overhead cold plunge shower and a communal soaking tub kept at 104°F. Sessions are gender-specific on Mondays and Wednesdays and co-ed Thursday to Sunday, with two-hour bathing at $50 including robe, towel and sandals. Reservations take up to four guests; private bookings suit groups of five or more.
