Depending on how far out of the way you are willing to go the Wisconsin Dells are only 2 hours (I believe) north of SFGAm, and provide plenty of credits, as well as some AWESOME waterparks (Noah's Ark, Kalahari, and many many others). The only downside is it can get expensive...fast, considering hotels, admissions and any up-charge attractions (bungee jumping and SCAD diving ) really add up quick. If you're willing to make the drive and pay the money then it's worth it.