Hokkaido is hands down the place you should visit in winter.
Blessed with the rich soil, the northernmost island offers fine crops, dairy products like cheese, and also great catches from the surrounding cold sea such as sea urchins and crabs. They make you want to come back many times to this gourmet kingdom. Outside a window is a wild snowy scenery. If you are into winter sports, there is no other place like this for you. Do get a chance to enjoy Hokkaido in winter!