This year, we took the kiddos to Sapphire Valley, NC. We flew into Atlanta, did the World of Coke and the Georgia Aquarium (love the Whale Sharks) and the next day drove to NC.
I was amazed at all the waterfalls we saw while there. The kids, however got bored after the second one. You've seen one waterfall, apparently you've seen them all.
Link to gallery here.