I would appreciate your help planning a rough plan for one part of our trip. We are an active couple who will be arriving to Denver in mid-August. We spend the night in Denver visiting friends and leave early the next morning (a Monday) for Keystone to see Mount Rushmore. We realize there is ALOT more to see in this area though and do wish we had more time to tour the area. We would like to make the most of the time we do have but within reason. The drive is 6 hours (without stops though) so we think we will arrive in the area early afternoon. We would like to see Rushmore during the day and then do the evening light show at 8pm. What else, if anything can we see that day? Should we do the Needles Highway? Custer State Park? Interesting hikes? Or just do a hike at Mount Rushmore? On our way out the next day to Cody, which way is best to go? Through Spearfish? Should we take the time to detour to Devil's Tower? We stay in Cody for the night (in a sheepherder's wagon) and then can take the whole next day to make our way to Silver Gate. 5 nights in YNP and 3 nights in GTNP. 3 more nights in Denver at the end for a wedding. We have booked all accommodations except the night near Mount Rushmore. Suggestions and advice?