Most Coloradoans know about hiking and camping in glorious Rocky Mountain National Park, biking around Lake Estes, checking out the darling shops on Elkhorn Avenue and tearing around the go-cart tracks. But most don’t know about the Rocky Mountain Nature Association, which offers a variety of half-day courses for kids and grown-ups alike such as geo-caching, animal tracking, stargazing and art sketching as a travel souvenir. Festivals abound in Estes Park during the summer–the Fishing Derby (June 1, 2013) and Wool Market (June 8-9) is free and fun for kids. Featuring many animals, performances and sheep-sheering, this event is especially ideal for tactile learners and kids with special needs. Estes Park’s Rooftop Rodeo in July 9-14 not only has all the staples of a great Western time but the parade features horses, trick riders, cowboys and more.
Rising from 7,800 feet to 12,000 – even 14,000 feet in some places – RMNP is a high-elevation park and if you don't give yourself time to adjust to the thinner atmosphere and lower oxygen levels, you could run the risk of getting the headaches, nausea and disorientation characteristic of altitude sickness. Along with taking a day or so to acclimate to the high altitude, you should make sure to consume plenty of water and food to ward off symptoms.
Colorado has one of the most diverse plant and animal environments of the United States, partially due to the dramatic temperature differences arising from varying elevation levels and topography. In dry climates, the average temperature drops 5.4 degrees Fahrenheit with every 1,000 foot increase in elevation (9.8 degrees Celsius per 1,000 meters). Most of Colorado is semi-arid with the mountains receiving the greatest amount of precipitation in the state.[64]
Ouray is one of the many historic Colorado mining towns that have re-invented themselves as outdoor playgrounds for adventure sport fanatics. The town is steeped in history, which you can explore at the Ouray County Historical Museum, the Ouray Alchemist Pharmaceutical Museum or on a tour of the Old Hundred Mine, before visiting one of the natural thermal pools that have been attracting visitors for over 100 years. 
In the subalpine zone, lodgepole pines and huckleberry have established themselves in previous burn areas. Crystal clear lakes and fields of wildflowers are hidden among the trees. Mammals of the subalpine zone include bobcats, cougars, coyotes, elk, mule deer, chipmunks, shrews, porcupines and yellow-bellied marmots. Black bears are attracted by the berries and seeds of subalpine forests. Clark's nutcracker, Steller's jay, mountain chickadee and yellow-rumped warbler are some of the many birds found in the subalpine zone.[72] Sprague Lake and Odessa Lake are two of the park's subalpine lakes.[72]
Every summer, Aspen gets taken over by classic music lovers during the renowned Aspen Music Festival and School with more than 300 concerts. Learn about Aspen from Dean Weiler during one of his popular Aspen Walking Tours and pay respect to John Denver at the John Denver Sanctuary you will pass by while hiking the picturesque Rio Grande Trail. Next read: best Aspen restaurants.
Explore the nearby great outdoors at the Horsetooth Mountain Open Space or get your adrenaline pumping by rafting on Cache La Poudre River with the Mountain Whitewater Descents Company. Visit Global Village Museum of Arts and Cultures to learn about folk art from all over the world. Take the kids to the Farm at Lee Martinez Park to learn about the farm life and play with baby farm animals.
