J.C.
Oh, be careful about the bars you set! I am amazed at the things I do once that my kids remember as a "tradition" they are cheated of if I don't do them again every year. Maybe mine are just odd kids, but the thought of having to do 25 days of crafts every year for 10 years makes me a little faint.
How about a nice advent calendar? Or something similarly easy. Maybe the kids could add a loop to a paper chain every day and at the end put the chain around the tree.