1. MK is a must. Look at
MVMCP if you are interested.
2. Visit the EPCOT resorts loop, BW, BC, YC Swan and Dolphin for the decoration. (Gingerbread house, candy merry go round)
3. EPCOT see the storytellers in the WS and see the Candlelight Processional. If you can't get into the CP, you can hang around outside the theater and see/hear a good part of it.
4. Do the MK loop of resorts, CR, GF, WL (The Poly not so much)
5. Osborne lights at the studios.
6. If you are inclined there are holiday tours offered.
7. If you have time DTD.