Red Rocks defies classification... so I am placing this post in the "Mountain" section because it is in CO and I'm not sure under what other title to place it -if you have a suggestion, please do feel free to share.
Red Rocks, as the name implies, is a rock formation and mostly red. It has been made particularly famous because of its naturally formed amphiteater that provide "accoustic perfection for any performance". The first series of concerts were produced between 1906 and 1910 on a temporary platform; see history and geology here.
Red Rocks Park is located near Morrison, CO, about 30 minutes due west of downtown Denver.
Hiking - Horsebak Riding - Mountain Biking Trails
The Trading Post Trail is a quick 1.4 miles and the Red Rocks Trail is about 3 miles, and can be extended to 6 miles by connecting into another Jefferson county trail.
We did the 3 miles loop and it was a very pleasant, casual hike. The day was rather overcast, so no sunny rocks (we went in Feb.) though still very impressive in their formation and coloring.
The trail altitude is 6,280 ft above sea level and appropriate for children, with a few areas of steep grades and road crossings. Please do stay off the rocks -this is a sensitive area, and this request is posted several times throughout the trail, even though we did see a couple people ignoring the signs... :(
The Ampitheater
It is apparently a very popular site for runners and work out groups.
There was a yoga class in session and numerous people either running or walking up and down the bleachers, which, at 6,400 ft altitude, will get you in shape.
The park is open daily from 5 am - 11 pm free of charge.
In case of performance, the park is closed to the public in the early afternoon.