Bush's bean factory has a nice café for a lunch and a museum that even your nephew will like. Its not big and wont take a lot of time to do. Take a day trip into Knoxville to the museums there and have an "urban" day. Take a hike up to Clingman's Dome. Dollywood is open all that week from 11am to 9pm. Townsend has The Appalachian Heritage Center and Cades Cove is near by in the park. Pigeon Forge has a Hard Rock Café restaurant that is great with a lot of memorabilia. The Old Mill restaurant is right by where the KOA is. The parking lot of the Smokies Stadium is decked out with a drive through light show at night, plus its near the Bass Pro Shop store and the Russel Stover outlet store. Also the Smoky Mountain Knife Works is up on that end of the strip.
There is so much to do all you have to do is go out and stop into things that look interesting. Google Maps is very helpful for getting around. Traffic will be heavy during that time too so bring lots of patience. If you have any other questions please ask.