We were able to get to Yellowstone on our first loop, last year, full-timing in our RV. We really loved it, but unfortunately were only able to spend one full day. We got some nice shots at Yellowstone, but the best shots came when we exited through the NE exit, and ended up going up the Beartooth Pass, at 12K elevation. We spent the night at the top, that was one hell of a drive.