If playing in a giant sandbox appeals to you, the Great Sand Dunes National Park and Preserve near Alamosa is a must-visit. This giant dune field of 30sqmi (78sqkm) features at least one dune that’s more than 750ft (229m) high. Sledding down the dunes is a popular pastime, as is hiking and camping. There are also horseback riding trails and the scenic four-wheel drive on Medano Pass.
Visit any of the 5 visitors centers in the park; one is registered on the National Registry of Historic Places and was designed by the Frank Lloyd Wright School of Architecture. There is a variety of landscapes to explore, from mountains to mountain tundra, and a wide array of wildlife. Whether you come for a day and do a short hike, or stay and camp out to go on longer treks, the scenery will impress you. Don’t miss the Arapaho National Forest or Indian Peaks Wilderness.