We have also stayed at the Grizzly RV Park outside Yellowstone, it is perfect place for staying in the area.
They allowed us to keep the coach there when we decided to extend our stay so that we could tour Jackson Hole which is 80 miles south. Grizzly RV Park is a really busy resort but they managed to find a spot for us to park the coach. I didn’t mind moving as our previous spot had been reserved.
We stayed in a hotel in Jackson Hole right on the square, neat city and good restaurants. The coach was safe at the Grizzly RV Park!
Safe travels,
Mark