Arima Onsen Taiko no Yu is one of the largest hot spring theme parks in western Japan, located in Arima-cho, Kita Ward, Kobe City, Hyogo Prefecture. The facility is themed around the Arima hot springs loved by Toyotomi Hideyoshi and offers 26 kinds of baths plus bedrock spa (ganbanyoku). You can enjoy three different springs at once: the miraculous Kinsen, a golden spring with the highest salt concentration in Japan emerging from ancient seawater 6,000,000 years ago from 60 km underground; the Ginsen, a radium-bearing weakly radioactive cold spring from the Rokko mountain range; and an artificial carbonated therapeutic spring. The main public bath’s Ultimate Lava Sauna uses Sakurajima lava and germanium on the walls and floor, a Kansai first. The room doubles as an all-round sauna/bedrock experience, with a power crystal (quartz) placed in the center to create a calming atmosphere. An auto löyly every 12 minutes brings the lights down and leaves the crystal illuminated, creating a meditation-like sauna space. You can also enjoy the rustic cold plunge pool cooled from the Ginsen, called Ginsen Rock Spring. Dining ranges from kaiseki restaurants to festival-stall–style food courts. It is a 10-minute walk from Arima Onsen Station, with a free shuttle bus available and free parking for 4 hours.