I have gone in October, and the weather was absolutely perfect for me - high 70- low 80 - if it is later in October, you miss the tail end of hurricane season, which can cause a little rain. The crowds were very light, however if you go over Halloween, it's busier. I still think it's one of the best times to go - oh, I almost forgot, a lot of kids get a 4 day fall break, so that weekend tends to be busy - it's usually around Columbus day I believe.