We usually go October but last year we couldn't add a day so we moved our entire trip a few weeks earlier and went the week after labor day. The crowds seemed to be higher than expected as far as wait times are concerned but I think the heat was making people ride rides they normally wouldn't just to get cooled off. Anyways...we went to blizzard beach and had a blast one day and now we have decided that's a must for our trips. Is September still the recommended month? Is there a better time where we could still do the waterpark?