Tucked away in the hills of eastern Oklahoma, Greenleaf State Park offers spectacular scenery and is a family-friendly state park. The park includes Greenleaf Lake as well as cabins, campgrounds, family recreation facilities and nature hiking trails. The lake cabins and other facilities at Greenleaf State Park were built in the 1930s by the Works Progress Administration (WPA). The original buildings, constructed of native stone, remain a lasting and beautiful tribute to those who built them.