This 30-square-mile dune field is another place without any official hiking trails. Start your hike from the main parking lot and head for High Dune on First Ridge. The total distance out and back is under three miles. Still, give yourself three to four hours for this strenuous hike. After all, zig-zag hiking on soft sand is generally more difficult than on more solid terrain. Still, the view from the top is worth the effort.