Rejoice, lovers of naked public baths, Thailand’s first onsen has opened. Yunomori Onsen & Spa is the real deal, so men must go commando. But in a concession to Thai modesty, women can keep a towel on—at least until they get into the tub. If you’re nervous, there are cartoons detailing the procedure (basically: strip, wash, bathe). The water is said to be sourced from a hot spring in Ranong; choose from carbonated, hot, cold or jet-equipped baths to increase blood flow and rejuvenate your skin. Rates start from B450 for all-day onsen, and B350 for Thai massage. Until the end of Oct enjoy onsen with massage at B690 and onsen with aroma therapy at B1,090. A Square, Sukhumvit Soi 26, Bangkok, 02-259-5778. Open daily 10:30am-12am, www.facebook.com/yunomorionsen.