Cross Country Greyhound Trip
 

On Tuesday I leave for Portland, OR from Baltimore, MD via Greyhound bus.
First half of the trip is from Baltimore to Minneapolis, MN where I will stay for a day to explore/sleep in a real bed/take a shower.
Second half of the trip is from Minneapolis to Portland via South Dakota/Wyoming/Montana/Idaho/Washington.
Wondering if anyone here has done this trip, either on Greyhound or driving, and if there is anything of note in these towns that I can see during my layovers:
SIOUX FALLS, SD
RAPID CITY, SD
BUFFALO, WY
BILLINGS, MT
MISSOULA, MT
COEUR D ALENE, ID
SPOKANE, WA
Also, any great sights from the road (other than the obvious scenery of these Northern states)?
Any input would be appreciated!

See the replies to the same question you posted on the US forum.