It's hard to find time for fitness over the holidays, especially if you have house guests or family in town. So get into the holiday spirit while getting moving. Assuming you don't live in a terribly frigid climate, bundle up with your significant other and/or family and take a walk to check out the holiday light displays in your 'hood.
Live in the city or on a light-free block? Research the best light displays in your city and take the car; just be sure to get out and walk around once you're there. Don't forget to bring along some lighted accessories to increase your visibility, and walk defensively against traffic and be on the lookout for cars. Make it even more of a celebration by toting a Thermos full of a warm beverage like apple cider or green tea. Just try to resist the cocoa.