Yunohama Open-Air Hot Spring

Perched on the rocky coast of Niijima Island, this free, 24-hour public hot spring mimics ancient Greek ruins and offers stunning panoramic views of the Pacific Ocean. Fed by natural, skin-soothing saltwater, its multiple outdoor baths range in temperature, making it the perfect spot to soak while watching a dramatic sunset. Expect a relaxing, open-air atmosphere where swimwear is required, allowing families and mixed groups to experience a unique island onsen together.

More in Tokyo