We'll be there from 9/24-10/3 also! Sounds like there will be atleast we 3 families! This is our 6th trip in Sept and we go especially for the low crowds and great swim weather! It is usually very hot and humid (I pack extra t-shirts - 2 a day!) with a short shower most afternoons that is over quickly and you get on with the day! Due to the heat, we usually head out first thing every morning and go back to hotel for early afternoon break/swim and then go back out late afternoon for dinner and go to the parks that are open later. The park hours at MK and MGM are shortened versus most other times of year, but you can accomplish so much with the minimal crowds that its not a big deal. We've never gone this late in Sept, and I hear crowds pick up as we head into Oct, but I think you'll really enjoy having the park rides walk ons! Jo