OT: Things to do in Cheyenne, WY

My brother and I are going to be in Cheyenne Wyoming for the day tomorrow with nothing to do. Anyone on here have any ideas/suggestions? Neither of us has been there before, and we're looking to kill time. I don't think we're planning on doing anything super active (hiking, etc.) unless there's something we really need to see.

Also, don't forget the bobblethon!