Depends somewhat on what you're flying and how high you're willing to go. If you can do 12,500+ for 15 minutes or so you can pretty much follow the Colorado river up to Granby (GNB )and then turn south and climb for Corona or Berthod Pass then drop into the Denver area. If you need to stay under 12,000 you can go north at Kremmling (20V) across Northpark and cross a little south of the Wyoming line. Or you can turn south at Minturn (Vail) and go over Tennesee Pass (10,424), past Leadville turn back east at Buena Vista (7V1) across South Park and follow the South Platte into Denver. Might depend on where in Denver your headed.