Kusatsu is one of Japan's best-known onsen towns. Ryokan inns dot this quaint area, which retains an authentic Japanese atmosphere. At the town's center is the Yubatake, its spring source, which emits large quantities of steaming hot, mineral-rich water. Catch yumomi, a ceremonial water-stirring performance, at Netsunoyu, right next to Yubatake. Don a traditional yukata robe and enjoy onsen hopping among the picturesque townscape or the outdoor baths at nearby Sainokawara Park. Alternatively, break from bathing and hike the spectacular mountains and natural scenery surrounding Kusatsu or, in winter, take to the ski slopes.