Our favorite RV park near Yellowstone is Red Rock RV Park, near Island Park, 12 miles from the west entrance to Yellowstone. It's 5 miles off Highway 20, so absolutely quiet, gorgeous views, large sites. May be booked up already, but if it fits your schedule, relax there a few nights. Beside easy access to Yellowstone, there are other great day trips to Ennis WY and along the Madison River. If you play golf, a fun little course in Island Park. Be sure to stay away from Highway 32, which is a scenic route from Jackson to Island Park, it is a brutal grade. Take Highway 33 to access Highway 20 to or from West Yellowstone to Jackson.