We were there last year the 12 days before Thanksgiving week. We came in to fall decorations still being up at the Fort. On the second night they took all that down and put up the Christmas decorations. None of the other resorts we visited had any Christmas decorations up. The parks were decorated for Christmas however.
The weather is kind of a flip flop. First two days were shorts and t-shirts, then it rained all day, then it turned cold for 2 days, like in the 30's for a low. Then warmed back up into the 70's for the end of the trip. Pack for all weather just in case.
Otherwise, I really enjoyed November and would have liked to have done it again except for having to take my daughter out of school for 6 days. This year going in October during her fall break will mean she only misses 3 days.