Hi Mark; the DWF and I go to FLA every year in September after the Labor Day Holiday is over. The crowds at UNI during the week is extremely low in September. This might change due to the New Harry Potter Attraction. If you never been to UNI you are going to love it. Go back a few years in a row and it gets boring. Hope this helps you out a bit. Lastly Uni is more crowded on the Weekends in September then weekdays. A two day pass you will seee everything. My wife and I have seen everything in both parks in one day and that was not pushing it because the crowds were really low up until the opening of Harry Potter this year.