Since I don't celebrate Christmas, I always try to ride on the 25th, if it's over 35 degrees and there's no snow/ice on the road. It's fun and quiet, but we always see other cyclists, especially if it's a warmer day.
If the conditions don't warrant a ride, I will be doing a local hike with AMC, to recover from the annual Chinese food fest that is obligatory for Jews on Christmas Eve.