Find Karuizawa Prince Hotel East at the foot of volcanic Mount Asama in Kariuzawa, about an hour by train from Tokyo. With an indoor climbing wall, luxe full-service spa with onsen (hot spring), and locally-sourced Wagyu beef at Breeze(SOFU), the resort is well-equipped to help you relax at any season. In the summer, soak up some sun on a leisurely bike ride. In the winter, take in the brisk mountain air as you navigate the nearby ski slopes.