The summit of Mount Blue Sky (14,130 ft) is one of Colorado's 54 14ers and is accessible to non-climbers via a short walk from the summit parking area. The longer Summit Lake Trail (5.3 miles round trip, 2,060 ft gain) is for fit and acclimatized hikers only. Summit Lake Park is the best wildlife observation point on the entire byway: mountain goats and bighorn sheep are regularly encountered at close range. Tip: No cell service at the Welcome Station, so print or save your reservation before leaving town. Also, descend immediately at any sign of bad weather. Finally, altitude sickness is serious at these elevations Acclimatize in Denver for a day before attempting the Summit Lake Trail. Pic: AllTrails