Jim & Marge,
There are 7 campgrounds in a 10 mile radius of Gettysburg.
Artillery Ridge is a PassPort American member and has horse tours of the battle field.
Gettysburg Campground hosted the North East Rally in 2008
Others are:
Drummer Boy- We use to camp here until their price went up
Round Top
KOA-Gettysburg
Granite Hill
As far as things to do. The battle field tour can take a few days depending on the detail you want to get into.
Adams county Vineyard is good.
Large Amish flea market in Thomasville, PA on route 30 east towards York about 22 miles from Gettysburg.
Beckley RV in Thermont, Md supported our 08 Rally and has given me good service.
I hope this helps.