http://koa.com/campgrounds/jackson-hole/overview/
In 2010, we stayed at Snake River KOA as part of our trip from the Oregon Coast to Yellowstone National Park. There are not a lot of campgrounds in the area and the ones that were available were expensive. We decided on Snake River KOA because we wanted to go river rafting and this park has excursions that leave right from the campground. We could also swim in the river to cool down. It is only a 15 min drive to Jackson Hole so its close enough for a day trip and a dinner out.