Well, knowing that teenagers can get into trouble (or be bored) anywhere, it's not going to matter much where you go:)
I can suggest Wilmington, NC (there is a KOA), but the activities are off site, such as the beaches, the Battleship (probably not her cup of tea), the Aquarium, Serpentarium, Museums, and down-town shopping. There is also a Waterslide Park (Jungle Rapids), bowling alleys, miniature golf, etc.
There is a pool at the KOA, but not very impressive one.....nothing like the KOA at Hatteras.
Usually, the beach is going to give them enough to do....and you can look into Surfing Lessons, Kayaking, etc.
And, you are still only an hour away from Myrtle Beach, if you wanted to take a day trip, or spend an overnight down there, at one of the other parks.
