Urbi ji seems like you are missing few things on the list such as * BOULDER FALLS * Pikes Peak by Colorado Spring * Cave of the Wind * Estes Park which is on the way to Rocky Mountain * Boulder down (quiet and nice to walk around if you like walking) * Denver Downtown , 16th Street Mall if you like BIG Buildings and shopping centers * NederLand (45 minutes Drive from Boulder and a little over from Denver) ( HILLSTATION/SKI AREAS ) * ASPEN * VAIL * SNOW MOUNTAIN RANCH