We have now camped in both Colter Bay and Gros Ventre campgrounds, we don't use the RV park as we don't really want to pay $55+ for a camp spot with hookups compared to about $12 a night for "dry" camping, if you have the Senior Pass. The RV Park will not honor the Senior Pass. We live about three hours from the Colter Bay campground and usually get there around 9:30 -10:00 and have never had trouble getting a spot, except for June last year when the larger side of the campground was closed for water line work. checkout time is 11:00 am so getting there around 9:30-10:00 has gotten us a spot that we want almost every time. We then went to Gros Ventre and had a nice time. My personal opinion is that Colter Bay is prettier and much closer to the lake and most of the things you want to see in Grand Teton. We go to Colter Bay with our FW and boat and we fish a lot, it's a lot closer to Jackson Lake, like right on the shore almost, compared to Gros Ventre so we like it more for that. From Gros Ventre, it's about a 45 minute drive to Colter Bay and the marina. We did see some great wildlife, moose and mountain sheep that we normally don't see at Colter Bay, so that was a plus. If you don't have to take a shower every day, four or five days in the "dry" campground is very doable and enjoyable. Whatever you do, make sure you take the cruise boat on Jackson Lake, maybe even the lunch or dinner cruise, it's something you will not regret. Then, also go to Jenny Lake and try to get over to Hidden Falls and Inspiration Point, they are working on the trails there this year. Also get to the Craig Thomas Visitor Center in Moose and then take the Moose/Wilson Road and go to the newest part of Grand Teton, the Laurence(sp) Rockefeller Reserve and Phelps Lake where they had their compound. They have totally taken it back to nature and you cannot tell there were over 30 buildings around Phelps Lake. Great easy hike and wonderful scenery. Whatever you decide, take your time, see a lot and have a great time.