Crater Lake at Maroon Bells is a short 2 mi hike that gains an elevation of around 700 ft. You pass through the Maroon Lake at the trail head and continue on the West Maroon Trail for 45-60 mins to the lake at the foot of Maroon Bells.
It is one of the most visited sites in Aspen, Colorado and absolutely worth the drive or the effort.

Looking down at Maroon Lake (above). Another view of the Maroon Bells from the trail head (below).
Silver Bells Campground Campsite #11 – for those who unload hastily. Go around the camp ground or better still explore the Silver Queen Campground a quarter of a mile away, for more astounding views.