I like to say there is no such thing as bad weather, there is just being dressed wrong for it!
So just make sure you layer up so you can shed or add layers as needed and head outside! ENJOY the crisp air! Play in the snow. Watch the frost glisten on the trees. Find the magic in the moisture freezing out of the very air so that even the AIR is sparkly. Laugh and make Calvin and Hobbs faces when your boogers freeze. There is no reason to be afraid of the cold!
Oh. And you might try snowshoeing too! Just about as simple as walking but a good way to get out in the snow and get a good workout going!