be sure to go to Cody and the museums..take the tour...If you stay at the ponderosa campground in Cody you can walk to Cody Museums ( they do not take credit cards..cash or check)..cross the street and get Bear spray..you will see buffalo for sure.in Yellowstone
...Custer's last stand in Montana was interesting ..one unexpected surprise ....eastbound on I-90 in South Dakota midway of the state...heard an odd noise like a rush of air that got louder...F-16 flying low following I-90...eastbound also...that will wake you up!!