If you don't have a car handy, the easiest resorts to visit will be those near MK and those near Epcot.
In GF you will find a huge tree decorated in Victorian Style. There is a lifesized Gingerbread house, and a great model train. Everything is done in reds and golds, and is quite ornate and beautiful!
At the WL, you will find a very cozy atmosphere, with a fireplace, a huge tree, large natural pine wreaths and garland.
At the Beach Club, you will find a large tree and a miniature carousel in the lobby, which is quite beautiful.
If I remember correctly, and they haven't changed it since 2000, at the Boardwalk the tree is decorated in many poincettias, and you will find poincettias everywhere.
To us, those were the most elaborately decorated resorts.
Have a great time
