Just five minutes on foot from Niijima Port, Yunohama Roten Onsen is an open air hot spring bath that offers a stunning panorama of the ocean, enhanced by Greek-inspired archetectural motifs. Best of all, these baths are free to enter.

Six baths of various sizes offer plenty of variety, and they're spacious enough to hold up to 80 people. One of the best times to enjoy a soak at Yunohama Roten Onsen is as the sun sinks into the sea, and the view of the sky on a starry night is a close second. Remember to bring a swimsuit for the mixed bath.