We stayed at the American Heritage Campground during Labor Day weekend to visit Bush Gardens. The campground is nice with a salt water swimming pool. They don't have much of a game room for the kids and they have clean bathrooms. I have a 37" trailer with four slides and I had no problems with my site. Check out this link with reviews of the campground:
http://www.rvparkreviews.net/Virginia.html#Williamsburg