Today Nora and I rode a bit on the just completed and gorgeous 44 mile Rio Grande Rail-Trail from Glenwood Springs to Aspen, CO
This paved trail follows the Roaring Fork River. The section we were on today was from Carbondale to Basalt. The Aspen were bright gold, the river was broad and glorious, the trail was new and well-maintained.
I took some pictures with my cell phone, but, unfortunately, I forgot to bring the adapter for the mini SD card, so I can't post right now.
It is worth a trip to Glenwood - not only do you have the new trail, but you also have the option of the spectacular Glenwood Canyon Trail - 18 miles, which can continue on to Keystone, if you don't mind some miles of US 6. That would be about 150 miles or so - so going all the way on the trail from Keystone or Breckenridge through Frisco, Copper, Vail Pass, Vail and out to Edwards, then riding US 6 to Dotsero, then the Glenwood Canyon Trail, then up to Carbondale, Basalt, Snowmass and Vail, about 150 miles.