I would definately sugest SFA as Superman makes everything else, even Apollo's Chariot, seem weak and, since you have the pass, SFGAdv. Hershey would be worth it, as would PKD, but both are 1.5-2.5 hours away, depending on traffic. Busch Gardens is almost 3,5 hours away, like SFGAdv, and is not included in any pass deal. but s the best of them all.
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Six Flags America IS a Six Flags park!