^We did IoA, Universal, SeaWord, Busch, Wet 'n' Wild and the Space Centre (about two days at each place) in two weeks and got everything done with plenty of time to re-ride and relax. We went right towards the beginning of July (basically two weeks before the rest of the 'main' schools broke up, so it was MUCH cheaper and the way our summer holidays worked meant we were already off by then) and the crowds were busy, but not that bad. So yeah, if you're efficient at parks, it's easily doable with plenty of time to enjoy yourself too.