Wreck It's a great age, I find, to involve the DCs in the actual planning of Christmas related crafts and activities as they are just so enthusiastic unlike DH. DD in particular loves getting involved and quite often comes up with some great ideas for crafty projects.
It's also great fun to think up new - to us - Christmas traditions together as a family, and we have been starting new ones every year for the part couple of years. Nothing major, just a walk around the village to see the Christmas lights with a thermos of hot chocolate and similar.