South Dakota: Corn Palace at Mitchell, Bad Lands, Pioneer Family Sod Home near Cactus Flats, Mt. Rushmore, Black Hills, casinos at Deadwood.
Wyoming: Devils Tower, Yellowstone, Grand Tetons. Utah: Olympic sites, Family History Library at Salt Lake City, Morman Tabernacle Grounds.
Colorado: the mountains.
Best Way To Get Around: A car is required, but Salt Lake City was working on a transportation system that should be awesome by now.