You'll wnat to go to Marine World on a Thursday in late May. Thursday is always the least crowded day and you want to go late becuase a lot of rides are currently under work(Roar, White Water Safari, Sling Shot, and V2.) Great America, just don't go on a Friday or Sunday afteroon or you'll find yourself overun by groups trying to have family day. also, Tuesday is usually the School Day where PGA is overloaded with buses.