Shirahama Onsen — Seaside Rotenburo Hot Springs

**Saki-no-yu experience:** This public rotenburo is Shirahama's most iconic onsen — a circular stone bath built on coastal rocks with ocean on three sides and no roof. Enter the wooden changing room (gender-separated), rinse at the washing stations (onsen etiquette: wash before entering bath), then step into the outdoor pool. The water is hot (42-45°C) — enter gradually. Find a spot facing the ocean and settle in. The bath holds 20-30 people but crowds thin outside peak hours (early morning 8:00-9:00 or late afternoon 16:00-17:00 are best). During high tide or storms, waves crash against the rocks and spray mists over the bath — exhilarating and slightly chaotic. Winter bathing (December-February) is spectacular — steam rises dramatically, the contrast of hot water and cold air is invigorating, and winter sunsets are crystal clear. **Onsen etiquette:** Japanese onsen protocol applies: fully nude (bathing suits prohibited), wash thoroughly at the washing stations before entering the bath, tie long hair up, and no swimming or splashing in the bath. Tattoos are generally prohibited in public onsen (Saki-no-yu enforces this). Bring a small towel for modesty when walking between changing room and bath (don't let the towel enter the bath water — place it on your head or beside the bath). Soaking duration: 10-15 minutes per session, exit if feeling dizzy. Hydrate before and after bathing. **Hotel rotenburo alternative:** For more privacy or if tattoos prevent public bath access, book day-use bathing at an onsen hotel. Shiraraso Grand Hotel (白良荘グランドホテル, ¥2,000 day-use) offers panoramic ocean-view rotenburo from elevated terraces. Reservations required (call ahead, some Japanese language needed). Hotel rotenburo are less rustic than Saki-no-yu but offer comfort, privacy, and equally stunning ocean views. Many hotels offer private family baths (貸切風呂, kashikiri-buro, ¥3,000-5,000 per hour) — ideal for those with tattoos or preferring private bathing.