Sakino-yu Onsen information
Mentioned in Japan's earliest history book (Nihon Shōki ) this fantastic bath sits in rocks next to ocean (taller waves might spill into the lower bath). It's 1km south of the main beach along the seafront road, below Hotel Seamore. No soap or shampoo provided, and gents note that your side of the bath isn't entirely private.
Come early in the day to beat the crowds.