We have gone both times, although I was little when we did it in May. Now we go last 2 weeks in August and the crowds are very managable. Rides won't be 10 minutes but they won't be 2 hours either. Like Splash could at most 45 minutes during the summer(I'm guessing). The crowds are also minimal becasue with the exception of the northeast, the rest of the country is back to school.