My son is going to be 14 right before Christmas. I know he does not believe anymore, but I want to surprise him just the same. How does one go about putting a bike under the tree? We have given our kids bikes before, but never as a Christmas gift. We usually buy used bikes as they need them - but this one is brand new from the store. He's getting other gifts - this is not the only thing, but I still want to surprise him.