What are some campgrounds with on-site theme parks?

Adventure Land in Altoona,IA

King's Dominion just north of Richmond, Va. A Six Flags sort of park (not part of that group) with a full service CG right next store. Exit 98 off I 95. Could also include a visit to Williamsburg, Jamestown and Yorktown on your visit. Lots of fun and history to enjoy.

Worlds of Fun in Kansas City.

Michigan's Adventure - Muskegon Mi - Duck Creek is right across the street
Cedar Point - Sandusky Ohio
Niagara Falls KOA Grand Island NY - Gate into Grand Island Fun Center

If your in CT keep it close Bear Creek Campground Lake Compounce Family Theme Park.

Silverwood In Idaho.

Hershey Park's High Meadow Campground has shuttles that run all day to Hershey Park. Or take the 5 minute drive from the campground to the park and pay for parking.

-Michael

Six Flags resorts, Great Wolf Lodges, anything Disney in the Orlando area, including Epcot and all the movie company theme parks? They usually have campground affiliates or on site.