Yasuragisou (Ushibuka Onsen Center Yasuragi no Yu) in Ushibuka, Amakusa, is a hot spring inn tucked into a quiet countryside. Day-use bathing is available, and the large public bath is equipped with a full-scale mist sauna that periodically emits loud bursts of steam and a thoroughly chilled cold plunge bath. With a pH of 8.7, its skin-beautifying hot spring allows you to enjoy a pleasant alternating hot-and-cold bathing experience.