Hi Heather!
What an awesome time to visit Walt Disney World Resort!
You can most certainly have dinner at any of the Walt Disney World Resorts and enjoy the holiday decorations. That is one of my family's favorite activities to do when we visit during that time.
Mickey's Very Christmas Party is so fun and the fact that the tickets are limited makes it that much more exciting. If history repeats itself, rides such as Big Thunder Mountain Railroad, The Haunted Mansion, Mickey's PhilharMagic, Pirates of the Caribbean, Splash Mountain, Space Mountain, etc. could be opened as they were in the past. An official list is not available just yet, but I am sure it will be soon.
For your Thanksgiving meal, any location you choose will be a hit, but here are a few that you might want to check out:
Liberty Tree Tavern at Magic Kingdom Park,
Whispering Canyon at Disney's Wilderness Lodge or even
Cape May Cafe at Disney's Beach Club Resort. Whatever your decision you will have a great meal, but don't forget to make your advanced dining reservations.
I hope this helps. Please let us know if you have additional questions, because we would love to help.
Have a magical day!
Raquel