In September we will be coming across to Black hills from Yellowstone via Billings and will spend 4 days in Keystone area doing tourist attractions nearby including scenic drives, Custer, Badlands. I've thoroughly researched this area so am up on tourist attractions but would like to know 2 things
1. What would be best places to have brief stops on way from Keystone to Cheyenne to Denver. We plan to drive this in 1 day and have to return our rental to Denver International airport by 6pm.
2. How do the tolls work on route as noticed on directions it mentions toll roads (we are Australian so not sure of American tolls and this will be first point we come across them)
Any advice on this route appreciated.