For a real interesting experience try going out for a Christmas Day bike ride the the early morning. Its one of the few days (and time) each year you can ride city streets with virtually no traffic!

I put lights on my bike, dressed a little warmer than usual, then rolled out the door at 4:30AM. Did about 24 miles (three 8 miles loops) on quiet city streets before dawn here in Huntington Beach (I counted only 10 cars on the road the whole time

). At that time the eastern sky was just starting to get light, so I rolled through another 10 miles on the barren Santa Ana River trail before it became inundated with new bike riders.
Definately worth the chilly air temp (30F) to experience the lack of vehicles and to see the first light in the morning.