Closed in winter but beautiful in every other season, the Lake is one of the loveliest in Japan. It has a French and English rose garden, a path around the edge with little bridges and waterfalls and reed beds, a sit-in wooden pergola with a far view of Mt. Asama, and even a punt from Oxford which on weekends guests can be poled around on while they enjoy the scenery. There's an admission fee but it's worth every yen.