Onsen

Onsen is a bathhouse on Eddy Street in the Tenderloin, built around a thermal soaking pool and a kitchen that serves food right at the facility. It's set up for walk-ins as well as day-pass bookings, so a visit can be as simple as showing up and settling in for a soak.

The space is adults-only, which keeps the pool area and dining room geared toward a quiet, grown-up pace rather than a family water-park feel. Pairing a soak with a meal is built into the concept here — the bath-and-dinner option is one of the main ways people use the place, rather than a bolt-on extra.

Schedule varies by day: it opens at 10am on Friday, Saturday and Sunday, runs from early afternoon (2pm) on Thursday, and starts later at 4pm on Monday and Wednesday. It's closed on Tuesdays. Everything wraps up at 10pm regardless of the day. Given the Tenderloin location, it's worth checking street conditions and parking options before heading over, and confirming current pricing directly since tier details beyond "moderate" aren't listed.

Beyond the bath itself, Onsen also handles gift certificates and group events, suggesting it's set up for both solo soaks and small private gatherings. For anyone weighing a visit, the core draw is straightforward: a thermal pool, a place to eat afterward, and flexible access without needing to plan far ahead.