I am returning to Yellowstone for the first time since 2006, with a group of 12. We will be doing a tour of the park on our first day. The rest of the week we will be riding outside the park. What are the must-see places within a reasonable ride of the park. Most of us are experienced east coast/mid west riders, but we do have 2 newbies coming. Only 2 of us will be playing off trail, I want to make sure the newbies see all the cools sights in the area, so they have a memorable trip. I don't want to miss any great photo ops.