If you are into that kind of thing
Enjoy it by spending time with your loved ones and /or by fragging a few people in TF2.
Remember, christmas season is a time of giving. Like pipes, rockets or arrows. And you can always add a pleasent surprise by dropping a sentry down the enemy chimney.
Speaking of surprises: What do you think, will we get a Christmas-Map from Valve?
Have a nice sunday ...