monarch crest out of Salida (high alpine)
Crested Butte!! is arguably the birth place of MTB.(High Alpine)
Closer to Breck check out Blackhawk area and or Floyd Hill!!
if you want beers pre and post ride from brewery at trial head—a fun day— i would suggest going into Golden, Co(Front Range), park at New Terrain Brewing, drink, and ride the trails right there — enjoy!!