Leadville, and the the Collegiate Peaks south of Leadville (also the Independence Pass area) is one of my favorites; it's a reasonable side trip off of I-80 in Colorado.
When you're in Boulder, be sure to drive up Boulder Canyon to the Peak to Peak highway, and check out the Indian Peaks (for the Grand Tour, take highway 6 out of Golden, continue on the Peak to Peak north to Estes Park, then return to Boulder via US 36).
Also, you'll be passing over the Mississippi between Iowa and Illinois. Just north of I-80 is Port Byron, IL and LeClaire, IA. To the south on the Iowa side is a Corps of Engineers lock and dam that could provide some interesting opportunities.
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