We stayed in the RV park in the woods at Colter Bay for 2 nights and one full day. It was actually the first day of our trip that we didn't have anything pressing to do, so we really enjoyed having a nice relaxing day.
It is a big RV park with over 120 space, but you still really felt like you were in a quiet forest. There was everything from very small trailers to huge motorhomes probably costing close to a million dollars.
Jackson Lake is very beautiful with high mountains on the other side and crystal clear water. The rocks on the shore are amazing with many different colors.