Sun Valley is located in Bowmansville PA (Berks County) and is Very close to Maple Grove Raceway. http://www.maplegroveraceway.com
The campground is about 75% Seasonals. Recently the campground appears to have undergone rennovations and the seasonals that are there are newer and well cared for.
The staff and campers have been very friendly on both of our visits.
Though we have never stayed during swimming season there is a very nice looking pool.
There are plenty of activities to keep the kids busy!
The pull through sites are a nice size, with a little bit of a slope to some of them (chock the tires).
Bath houses were cleaning and maintained several times during our stays, the showers are push button, which can get a bit annoying, but I am sure it saves on water.
We've stayed at Sun Valley twice, and if we were to go with a seasonal site I think it would be there. We look forward to staying there again soon!