From the Denver area, drive Interstate 70 to Glenwood Springs, Colorado. Travel south from Glenwood Springs on Hwy. 82. About 12 miles from Glenwood turn southwest onto Hwy. 133 at Carbondale. Continue on Hwy. 133 past the town of Redstone. Just before the ascent to McClure Pass, turn left onto County Road 3 toward Marble. Five miles from Hwy. 133 turn left onto Serpentine Trail. Follow this dirt road 1 mile and turn left at Bannockburn and the Marble Retreat sign. The retreat lodge is found in the cul-de-sac at the end of the dirt drive.