We collect an RV in Denver on March 31st and return to same location on May 12th. At this stage we plan on heading through the Rocky Mountains to visit most of the National Parks in Utah before driving North to the Grand Tetons, Yellowstone and over to Badlands and Mt Rushmore before returning to Denver. Based on the above we would be at Yellowstone in the first couple of days of May and I notice the only campground open at that point would be Madison campground without any hook ups. I realise this is weather dependant but I gather it should be fine to park the RV at the Campground for a few days to enjoy Yellowstone. Are there any other options such as simply booking a room for a few nights to ensure we don't is out on visiting Yellowstone? Thoughts appreciated.