I would do Trail's End if you are interested in Christmas decorations.  I would also seriously consider either booking a private sleigh ride or doing one of the wagon rides to see the camper decorations - they are really neat!  If you are doing the monorail loop on your resort hop, Ft. W is very easy to get to via boat from CR or MK.  I would recommend going to BC at some point, though, if you can, as the holiday carousel in the lobby is stunning.