You will love this time of yr. at WDW! The castle lit up with the icicle lights at MK is spectacular, and the projection show on the castle(one of our faves) has an extra Christmas part(not sure if it is the same one during the party). The Jungle Cruise becomes the Jingle Cruise, with Christmas decor and jokes, if you get a chance to ride it. You might want to hop the monorail to GF if you have time, to see(and taste!) the giant gingerbread house they build in the lobby. There is also a chocolate carousel at the Beach Club right outside the International Gateway at Epcot. We love the Candlelight Processional at Epcot, as others have mentioned, but you will need a dinner package to get a guaranteed seat, or you can get on line for extra seats, or watch from outside the theater to see and hear some of it(but won't get the full effect). DD enjoyed the storytellers as well.