For something more drastic, take a quick vacation to a warmer climate. It doesn't have to be the Caribbean. Florida or California is right up (or down) the coast! If you can't afford to go away, and you're in a location where it snows, then you're probably not that far from some slopes. Time for a ski or snowboarding lesson. Fun and exercise! Win win.

Source: http://resources.purematters.com/blog/post/8-winter-weather-pick-me-ups