Gonna be making a dash up to the Badlands National Park area for a day, then continuing east to Chicago to visit friends & family, stopping off somewhere half-way! If you join me for part or all of the trip, you'd have to find a train or bus back from South Dakota or Chicago if you're looking to return to the Denver area though. I've got room for one or two more in the car depending on your luggage.
(Connect with Ben to see this)