I'm planning a trip to Yellowstone over Labor Day weekend with two of my sisters. We will be flying to SLC and spending 2 nights in Jackson Hole prior to Yellowstone so will enter the park from the south. From there we have 3 nights in/near the park with reservations on night 1 at OF Inn, night 2 in Gardiner, and night 3 at Lake Lodge. I would like to take I 15 back to SLC so will probably exit the park from the West. Based on our lodging I'm thinking we will probably drive clockwise around the park but would appreciate some suggestions for possible itineraries those days. We want to hit the major sites and also be able to break up the driving with some hiking. It seems like there is so much to see and it is a little hard to sort out what is a "must see" and how much time to allot for each area. Any input would be appreciated. Thanks!