The Historic Jungle trail winds for nearly 8 miles along a sandy road through the hammock habitat of Florida's barrier islands north of Vero Beach. The trail—really a road—is on the National Register of Historic Places and was built in the 1920s so that citrus growers could haul their produce up and down the barrier island. Although cars do drive along the road, it's mostly used by cyclists, walkers and joggers. The road is sandy but mostly hard packed and easy going for wide-tire bicycles.