Snow-fed rivers tumble over granite boulders in the Rocky Mountains, creating an ideal environment for fly-fishing and whitewater rafting. The state's most famous river -- the Colorado -- flows from headwaters in Rocky Mountain National Park, with alternating stretches of heart-pounding hydraulics and quiet areas where you can wade out and cast your fly. Stay at a Bureau of Land Management campground along the shore, or at private riverside cabins such as those found at Colorado Cabin Adventures 3 miles from Grand Lake. For a more remote experience, stay at Cottonwood Cove, tucked along the banks of the Rio Grande just downstream from the picturesque mining town of Creede.
Spa facilities are quite unique - hot springs are housed in the teepee and bath house, while the massage and yoga rooms are located in the Pony Express Stop. Direct feeds from geothermal springs in some of the guest cabins are even more surprising and a fun adventure honeymoon idea. Spa treatments offered at the spa include wraps, reflexology, Trager Therapy, hot rocks massage and other holistic and therapeutic healing techniques. The resort is situated near the Four Corners and in the midst of two national forests where you can enjoy hiking, climbing, snow-shoeing, back country skiing, heli-skiing and fly fishing on your adventure honeymoon.
Settle into a cozy log cabin on Chicago Creek in Idaho Springs. An iconic historical marker, a water wheel that powered a stamp mill, is visible from US 6 and US 40. Idaho Springs abounds with places to hike, ride, view wildlife, or do some birding. In the winter, take some easy ski runs at the Echo Mountain Resort. Drive up the 14-mile-long Mount Evans road, the highest paved road in America, and enjoy the surrounding landscapes from 14,200 feet above sea level. When it’s time to relax, head over to the geothermal springs and caves at Indian Springs Resort.
SouthwestOuray has been a special destination of world travelers for more than 100 years. This small intimate community is nestled in some of the most rugged and towering peaks of the Rockies. Set at the narrow head of a valley at 7,792 feet and surrounded on three sides with 13,000 foot snowcapped peaks - Ouray has been eloquently nicknamed the "Switzerland of America." 
Buena Vista is an historic mining and railroad town that resoundingly lives up to its Spanish name meaning “good views” – you are surrounded by towering mountain peaks that provide a wonderful year-round playground for adventure seekers. The area boasts some of the best river rafting adventures in the country and you can also go hiking, biking, horseback riding, fishing and zip-lining.
Brian and I descended back to ~7,000 feet for dinner in a small-town Indian restaurant in Nederland, Colorado, west of Boulder. By then, both our heads ached like a bad hangover, and my lungs literally burned when I tried to inhale anything but shallow breaths. Add generalized joint pain, and I had a full-blown case of altitude sickness. Given that I am a noted hypochondriac, I expected the worst.
