I'm planning a road trip with a group of 5 people from June 21st to July 2nd. We want to leave Chicago in the early afternoon on the 21st, rest in Rapid City and see Mt. Rushmore on the 23rd. Arrive in Yellowstone on the 24th and stay until the 28th,head to Colorado Springs to ride up to Pikes Peak on the cog railroad.We stay until the 30th then come back to Chicago on the 2nd. Are there any spots on the way where there will be a lot of traffic? Also, are there any scenic roads we should take?