John & Mildred Cooper Nature Preserve Trail System, Rocoso Drive. No Charge. Join us for a free guided interpretive hike at the Cooper Nature Preserve. We’ll be joined by Ouachita Rivers Project Specialists of the Nature Conservancy. Registration is not required. Sponsored by the Nature Conservancy, Trails Committee, and Parks and Recreation Department. For more information, contact Parks and Recreation at 501.922.0322.