Tohoku (東北 Tōhoku, literally "East-North") is the northeastern region of Japan's Honshu island. In winter, the Snow Country (Yukiguni) of the western Japan Sea coast racks up some of the highest snowfall figures in the world, which also means great skiing and lots of hot springs to warm up in. Tohoku also has many castles and samurai residences, making it a good place to take in some history. It also serves as a good backup plan for cherry blossom viewing, since the trees blossom a few weeks later here than they do in Tokyo/Kyoto.
Source: Wikivoyage (CC BY-SA)