We were there in mid May and stayed at Madison Campground. We chose that because it was centrally located. The park is as big as the state of Rhode Island so you will do a lot of driving.It is about 16 miles from West Yellowstone to Madison, then about another 18 miles to Old Faithful. From Old Faithful to Mammoth Hot Springs is about 59 miles.Plus, there is lot to see in between.Look at one of the NPS maps and the distances between different areas of the park and you will see what I mean. Plus, depending on when you go you will have to put up with buffalo or bear jams which will slow you down. We stayed in the park for 4 days. We should have had at least 2 more.You have a fully self contained camper. Why not split it up by staying a few days in a non hookup campground in the park, then move to Fishing Bridge where they have hookups and then spend the last 2 days at Mammoth Hot Springs? At Mammoth, you are about 6 miles south of Gardiner,MT which has a grocery store,gas and nice restaurants.They also have gas and restaurants throughout the park. We really enjoyed the Inn at Old Faithful. Good food and reasonable prices.Even though most campgrounds don't have hookups, many like Madison allow generator use.We would run ours for about an hour in the morning and an hour in the evening to charge batteries,use the microwave or my wife's beloved curling iron. Each visitor center is different so make sure you stop at each one. We were lucky to see a mother grizzly and 3 cubs on our way from Norris to Canyon.The Grand Canyon of the Yellowstone is beautiful.The lower falls is really picturesque.Prepare yourself by checking out all you can online ahead of time or get books on the park so you can decide ahead of time what you want to see. And they have books in the park too. One I bought and really enjoyed was " Death in Yellowstone".It tells about all the people who died in Yellowstone since it's inception. Some died from disease, some froze to death, some were murdered and one couple drove over the cliff at the Grand Canyon! Maybe a little too macabre for some but I just want to know as much as I can about the places we visit.I hope you enjoy it as much as we did. It was our favorite trip ever.
