I arrive the Saturday after Thanksgiving, when all the christmas decorations are up and I do a couple of loops to see several resorts at the same time.
The most fun in the monorail route (CR, GF, and Poly) then I return to MK and take the boat over to WL for lunch/snacks at the lounge.
There is also a boat that goes from Epcot and DHS, that does the BC/YC/BW/Swan/Dolphin loop as well. A nice way to end the evening is to stop at BW and check out some of the outdoor entertainment.
You can also go over to DTD and take the water taxis to SSR; POR and POFQ; and OKW. They are three different water taxis, but you get to see a lot of DTD and the rides are wonderful in the evening.
There is also entertainment at POR and POFQ - POR is especially popular with Yee-hah Bob. He is in the lounge Wednesday through Saturday from 8 pm to about midnight. He recognizes people in the audience for special occasions and there is a lot of audience participation. The kids love it, as well as the adults.