We went to Disneyworld last fall (arrived the Saturday after Thanksgiving) and it was awesome! The first day was a little crowded but Monday-Friday was dead. The longest wait was about 20 minutes and many times we walked right up. Most of the northerners were using the pools and waterparks! Check Disney's off times, they have cheaper rates.

Texas is wonderful in the fall, still warm here. I think Carnival, Norwegian and Princess cruise lines leave out of Galveston in the fall.