The parade, the show in front of the castle and the fireworks I would say are must see. There is also a new show this year in tomorrowland called "Totally Tomorrowland Christmas" It features Buzz, Mike from Monsters Inc. and Stitch. It was an ok show but I would rather do the parade, the fireworks and the show in front of the castle. Also the abliity to get on most of the attractions with a minimal or no wait is a definite plus.