Cheyenne Mountain State Park & Rocky Mountain National Park

Agree with 2gypsies - any bike riding in Rocky will provide you with just dirty looks at best. Roads are - unless massive change as I have not been there for three years - two lane with no bike lane. Narrow shoulders and, in many cases, dropoffs with no guardrail. All the years I lived in Estes and spent a lot of time in the Park I saw very few bicycle riders.