Suppose it depends what route you are planning on taking. When we stayed in Yellowstone we stayed in the explorer cabins and didnt camp. The wife still has limited desire for camping, so glamping when she can. Lots to see in the park if you havent been. I took my 2 little ones March last year and it was amazing.
The southern route takes you through Utah and right by Zion National Park. You will also go right through Island Park in Idaho which is home to Henry's Fork and Fly Fishing mecca...