COLORADO Timed Entry During peak seasons, some national parks and attractions let you guarantee your access with a timed-entry or day-use reservations. Check ahead to secure your spot. Great Sand Dunes National Park & Preserve 3 LUMENATI PRODUCTIONS; DANIEL FORSTER Explore Our Parks & Monuments Colorado’s natural assets awaken the imagination and stir the senses. Come to life walking a trail to the twinkling tune of aspen leaves, wrangling a feisty rainbow trout, crunching over pine needles while twisting along on a mountain bike, sitting beside a babbling creek for a picnic, or witnessing the wonder of bighorn sheep moving from one rocky ledge to another. Our four national parks, nine national monuments and 43 state parks have preserved special moments like these — and millions of others — for visitors to carry with them for a lifetime. Rocky Mountain National Park COLORADO . COM 11