I've given myself 5 days to travel from just west of St. Louis to Great Falls. I've only done a few ride of around 500 to 600 miles in a single day. I live in NC, so I'm used to twisty roads through mountains. I'm a history nerd, so Little Bighorn is on my must-do list, with about a 3 hour stop. I'm trying to prioritize sites to see along way. So far, I have Mount Rushmore, Devils Tower, Red Gulch dinosaur tracks, Grand Teton, Chief Joseph Pass, Beartooth Pass, and then some family history around Sioux Falls and Anaconda, MT. If you had to eliminate one of the passes or Grand Teton, which one would go?