Yellowstone Park is a unique and interesting place. With my job I get to see it a way that not many other people get to. I am a flight nurse out of Billings, MT and we fly in to get people out of the Park when they are hurt or sick. The one thing to remember is that althought the animals seem tame, they are still wild. That is what gives us some business each summer. bear attacks, buffalo gorings and such. Sept. is a great time to go just to hear the elk bugeling. Hope you get there and hope I don't have to see you in my line of work. lol