If Colorado is the place for outdoor recreation, and Boulder is its mecca. Just 35 miles northwest of Denver, Boulder is home to Estes Park, the eastern gateway to Rocky Mountain National Park, where altitude, natural geography, and peaceful views top the reasons to hop on your bike and check it out. Another gem, Chautauqua Park overlooks Boulder and makes for the perfect route to the Flatirons. Its well-marked trails are not only clear and exciting, but home to many cultural events during the summer. Read more about the worlds best cycling locations at the cheapflights.com blog.