My favorite is Winter Park, CO- about hmmm maybe 50 miles west of Denver and then maybe 30 miles north. Another good place is Crested Butte. Oh, wait I almost forgot about Salida. There is a trail along the continental divide that starts up on Monarch pass... That one is a classic but you better bring your lungs heheh. I can provide more info if you want to visit any of these areas. But to me it would be: #1- Winter Park, #2- Salida and the Collegiate Peaks area, #3 Crested Butte.