You're off to a good start. This is a "must do" loop that can be done in 1 day, but is better split into 3 days. I can assure you that it will be the highlight of your trip. There's a good reason so many Arizonans flock to SW Colorado in the summer
San Juan Skyway Scenic Byway - Passing through some of southwest Colorado's most historic places, this 236-mile byway loops through Durango, Telluride, Ouray and Cortez. Popular sites include Mesa Verde National Park, the Durango-Silverton Narrow Gauge Railroad and Chimney Rock Archaeological Area.