We just got back a couple of weeks ago. We stayed at the Split Rock Resort, which has it's own indoor waterpark called H2Oooh! and that was a lot of fun! We also went to an amazing amusement park called Knoebel's. www.knoebels.com, I think. MILLIONS of rides for the little ones - it was great! There's also a zoo called Claws and Paws down there that my kids loved, tho it kind of made me sad (just wasn't enough space for 2 adult lions in that one habitat, to my thinking).
The Crayola Factory is down there, too! http://www.crayola.com/Factory/
Restaurants we enjoyed with the kids: Terra Cottage (for breakfast anytime, and you can sit outside, in covered and uncovered areas), Piggy's, and The Boulder View Tavern, which looks swanky, but was great for the kids.
Have a great time!