We enjoyed our stay at the Casa Vargas hipcamp. Juan was very responsive and has helpful. There are 2 sites closer to the entrance, 3 sites that are right next to the lake, and one site farthest away that has gorgeous views of the fields. Most sites are have a picnic table and stone fire ring. We were the only ones on the last day and got to check out the sites close up. The point is the best one in my opinion (roomy, sun and shade, best view of the lake) and we would love to check that out next time.
We stayed at the Waterfront tent site with our dog. You can drive right up to it and it is steps from the water. It was peaceful, with sounds of birds chirping and you can see lots of wild life (all sorts of birds, butterfiles, toads, even a snake swimming by). At night the toads come out and because this site is right next to the lake, several toads were hopping all over. We had to rinse our dogs mouth out after she licked one- just a word of caution if you have a pet. Our site and the one next (the view) didn't have much shade so I'd suggest packing a canopy and grill grate if booking one of these.
The town of Culpepper is about a 15-20 minutes drive with plenty of stores and restaurants. Old House Vineyards is also a decent 20-30 minute drive and highly recommended (crystal clear pond features, gardens, good food/ beer/wine/spirits).