Getting naked, hot and wet with a bunch of total strangers is perhaps the most quintessentially Japanese thing to do. There are several onsen (natural thermal hot springs) scattered the length of the Hakuba Valley. The mineral content of almost every onsen in Hakuba is slightly different, and many onsens use the healing effects of their particular mineral mix in their marketing. A trip to Hakuba is not complete without a trip to the onsen.
How to Onsen