Today you may visit Nikko and feast your eyes upon the breathtaking countryside, sacred shrines, and stunning temples. Recommended to visit Toshogu Shrine, a UNESCO World Heritage site dedicated to Shinto worship, and then absorb the natural splendor of Lake Chuzenji and Kegon Falls.
If time permits, one of the most popular ways for Japanese people to relax during the holidays is to go to an onsen. Featuring hot springs irrigated by natural water, usually originating from a volcanic source. They are well known for having therapeutic benefits. A popular onsen spot near Tokyo is the Nikko area in Tochigi prefecture, such as the Kinugawa onsen. A popular hot-spring resort town, surrounded by dramatic hills, and built along a river that's carved a steep gorge into the land. You have an option to stay for a night in Kinugawa Park Hotels Onsen or go back to your accommodation in Tokyo.
This is an optional side trip from Tokyo and worth trying!