Did You Know You Can Climb the Largest Sand Dune in North America Great Sand Dunes National Park yes You must plan a family trip to the Great Sand Dunes National Park asap Here are our favorite hikes to make your planning easier Easy Hikes 1 High Dune 699 ft elevation gain 1 2 miles r o u n d -trip 2 Star Dune Trail 750 ft elevation gain 1 2 miles r o u n d -trip 3 Dunes Overlook Trail 300 ft elevation gain 0 5 miles r o u n d -trip 4 Mosca Creek Trail flat 1 5 miles r o u n d -trip