In North Dakota is Theodore Roosevelt NP. In the Black Hills we have stayed at Rafter J Bar 5 times. They have trail rides on the site and loads of space. We went to the area with small children and lately with Grandchildren. Adding all of the options like Custer SP, Deadwood, etc there is a week worth of enjoyment there. One time, when we were at the Grand Canyon we took a plane ride through the Canyon, Bryce, and Monument Valley. That was before kids and money wasn't short then. It was a trip we always remembered.