Six Flags Great America just open a week ago on April 23 and 24, but the waterpark does not open until May 22. Good deal with the season pass: Get 4 or more and get parking on one of them. If you get the gold dining pass, you can redeem your free refill cup all season long. With the dining pass, you get lunch, snack, and dinner. Your dining pass is $80 Dollars, but you get a lot for that. You can use it all season. And with season pass you get unlimited visits to the park and the water park. Have fun this summer!