I agree with the previous poster. For the Peninsula campaign, you would be best to spend half a day or so driving around to see the 7-Days battle sites near Richmond. You get to see Cold Harbor along the route too, and I find this one pretty interesting because it involved a lot of trench warfare like Petersburg. Along the drive near Richmond, here is what you get to see: Chickahominy Bluff (the tour starts here - see mostly woods from the overlook and a few trenches); Beaver Dam Creek - short walk along the creek - no monuments or anything; Gaine's Mill - house, few cannons, nice walking tour down to the creek and ravine; Cold Harbor - little in the way of monuments or cannons but lots of trenches, nice short walk and another short driving tour, one old house, and the national cemetery - has a visitor center; Malvern Hill - lots of cannons - up the road before you get to the battlefield is the Glendale National Cemetery and visitor center. They are the highlights. A ranger told me there is nothing really to see at the unpreserved Fair Oaks/Seven Pines battlefield (near where the airport sits now), but there is supposed to be a cemetery there.