With such a short time left...

I ponder what have I not done yet that I really would like to do since I am already this far west. I am going to Yellowstone this weekend, so that will make 6 states that I have been to on my journey in Montana (Montana, Idaho, Utah, Arizona, Nevada, and Wyoming). I have been to a natural hot springs, I have seen the art movement in Whitefish, I have seen some of the historical things like Madison Buffalo Jump and Bannack. What else is there that I should not leave the state without seeing? My guide book is full of things but most of them don't really interest me and won't produce pretty pictures. Anyone with suggestions?