Hi there, Nope you can park at one and take the free shuttle to the other park. We do it all the time. We have an annual pass to SW which includes parking, so on Aquatica days, we park at SW for free, the shuttle is down past the gate entry to SW at the very end. The shuttle will come every 10 to 15 mins, and take you over to Aquatica or vice Versa. Only at Aquatica, it parks right outside of the entrance.