O'Leno is a good example of a state park in Florida. Surrounded by the tall, shaded woods of a beautiful hardwood forest, the Santa Fe River disappears in a large, slowly swirling, tree-lined pool. After appearing intermittently in scattered sinkholes, the river rises three miles downstream in a big boil, then continues on to meet the Suwannee and the sea. Nearby, stands of cypress mirror themselves in the still waters, walls of dense river swamp rise before you, sudden sinkholes open in the woodlands-rich with cool ferns and mosses. Farther from the river, expanses of longleaf pinelands stretch across rolling hills. In the midst of this lovely setting, you find 65 campsites, 18 rustic cabins, and a pavilion for group meetings. A diving platform marks a good place to swim in the soft, cool waters of the Santa Fe, and canoeing up this dark river is like traveling backwards in time in the direction of original Florida.