Your time frame will be a busy time to go.. if you do not like mega crowds, do not go. The only day that may not be too bad would be the 2nd & 3rd.. but you will be leaving on the 3rd. Normally anytime between Christmas & New Years is swamped. There have been days that the parks had to stop allowing guests in. If you plan on going, get there first thing in the morning or you may not even get in...