Onsen Etiquette in Japan (2025): Simple Guide for First Timers Quick guide: Rinse before soaking, no swimsuits, keep towels out of the water, and enjoy quietly. Japanese onsens are for relaxation, not swimming. Tip: Stay connected for maps & translations → Best eSIM for Japan 2025 Before You Enter Wash thoroughly: Use the shower area to rinse and scrub before entering the bath. No swimsuits: Japanese onsen are nude bathing areas—towels are for drying, not covering. Hair up: Keep long hair tied to avoid touching the water. Inside the Bath Keep towels out: Leave them on your head or the ...