Did you know the state of Colorado is larger than the United Kingdom?
Colorado is a state in the United States encompassing most of the Southern Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains. Colorado is part of the Western United States, the Southwestern United States, and the Mountain States. Colorado is the 8th most extensive and the 21st most populous of the 50 United States
Area
Ranked 8th • Total 104,094 sq mi (269,837 km2)
• Width 380 miles (610 km)
• Length 280 miles (450 km)

What does this mean for riding? Well first off it means that you cannot see the state in 4 days. If you are off-road riding then think about doing an 8-10 day loop out of Denver. I recently did an editorial for Bike Magazine and they asked me for my favorite ride. This is simply an impossible question. The terrain is so variable that it all depends on what you like.

Thanks Wikipedia!