National parks are federally protected places for a reason — they’re beyond incredible. Colorado preserves some majorly captivating sites while offering an exciting line-up of recreational activities. Many guests are content with low-key offerings such as hiking, biking, fishing, wildlife viewing, and scenic driving. Some of us crave more. Thrill-seekers, read on. Time saver: A single-day automobile pass into any of Colorado’s four national parks costs $25, or you can purchase an America the Beautiful pass ($80 annually) for hassle-free entry into all national parks for a year. Surf America’s tallest sand dunes Ready for a national park experience like none other?