My son announced today that he really would like to go to Yellowstone for vacation after school is done end of the month. My initial reaction was there is no way we find lodging. I checked and everything is full. We are looking at 5 days to yellowstone. What are our options? We can fly into Salt Lake and drive over. It appears Jackson is very expensive to fly into. I am open to staying outside the park and drive in each day. We aren't very active in terms of hiking, etc. my son mainly wants to see the geysers, animals, waterfalls, etc. please advise. Thanks.