If you can go in May or September, that would eliminate the crowds. We stayed at Madison Campground in mid May 2016. They don't have hookups but allow generators. Madison is centrally located. While not everything is open in May,most of it is.The daytime temps were in the 50's and 60's. Night time it dropped to the high 30's. I would suggest getting reservations for the Inn at Old faithful. The lobby is beautiful. I read that it is the largest log structure in the world.The food was good and the prices reasonable. The Grand Canyon of Yellowstone is like "wow". We saw a grizzly with 3 cubs on the road from Norris to canyon. They walked right by our van.We took our video to the visitor center at Canyon to show the ranger. A couple was there and the woman said this was their 4th trip to Yellowstone and they never saw a grizzly.I guess we were lucky. If you don't stay in the park, you will spend a lot of time driving back and forth. Yellowstone is about the size of Rhode Island.
