Have a great visit. Flagg Ranch is right at the south entrance and easy driving distance to all the feature in Yellowstone. While you are there, don't forget to take in Grand Teton for at least one day. Some of the most beautiful scenery in the world. If you were to go there, try to take the cruise on Jackson Lake to truly understand the beauty of the Tetons. Also go to Jenny Lake to see a truly beautiful place and take a short hike around the lake to see Hidden Falls, it's well worth the trip. If you get tired of Flagg, Colter Bay campground is just a short trip down the road, about 25 miles or so, and has a lot of space, both dry and full hook-up. Hope you have a great trip.