[Rot 911]

You are getting up in my part of the US. Here is what I would recommend once you get to Cheyenne. Leave out of Cheyenne and hit US 85 to Lusk, Wyoming. Then head east on US 20 towards Chadron, Nebraska. About 15 miles before you get to Chadron, you can head north on US 385. US 385 will take you all the way up to Custer, South Dakota. From there, you can either continue on US 385 and then east on highway 244 to Mount Rushmore, or go east out of Custer on 16A Which will also get you up to Highway 244 and then you would go west to Mount Rushmore. 16A is much more scenic, but you are going to be there in the middle of July and traffic is horrendous on 16A. It has several hairpin curves and traffic is usually backed up and never going more than 20 miles an hour. Personally, I find Mount Rushmore to be a bit of a letdown. Quite the tourist destination.

When you leave Mount Rushmore, head west again, on Highway 244 back to US 385. Stay north on 385 and it will take you all the way up to Deadwood South Dakota. Fun place to visit, but will be packed with motorcycles in July. Head north out of Deadwood on US 85 up to I 90. I 90 west will take you into Spearfish, South Dakota. But just before you get to Spearfish, you can exit onto Highway 14A. It will go west for just a little bit and then go south into Spearfish Canyon. Spearfish Canyon, to me, is well worth the drive. Once you get to the end of Spearfish Canyon, turn around and head back up to Spearfish. Hit the bathroom, get something to drink, and then head north on US 85 To Bowman North Dakota. Nothing to see there, but you will have been in North Dakota, and then can head west into Montana. At Bowman, take US 12 west which will take you to I 94 down into Billings.