愛らんどセンター 御神火温泉

710 yen, near the main port. When overnight boats from Tokyo arrive, it opens at 6 AM, otherwise from 9. Onsen somewhat resembling a super sento: two baths at 40, sauna, cold bath, three lying baths, and a bath where you can stand on a cube while a water jet falls on you. Clear water, no smell. Very pleasant onsen, feels like a local community center since there's also a tiny gym, a cafe, and a pool.