We took a vacation to Wyoming to visit family and camped a few nights at Yellowstone. Besides it is hard to travel with a baby, we had a great time.
There was a lack of research beforehand, so we mostly just did all the crowded stuff. Yellowstone is huge and next time I would like to do things we haven’t done before, and also things that are less crowded. Our favorite thing was something that was off the beaten path and now swamped with people, the Sheepeater Cliff campground.