Runners need oxygen, and a trip to Hugh Taylor Birch State Park puts them close to the source: trees. The running path, so dense with green that runners need to duck under low-hanging branches, is a triumph of photosynthesis. Leave the iPod at home and listen to the symphony of subtropical birds overhead. And while there's only about one-in-a-million chance that an alligator will leap from the foliage and dive for your ankles, that's just enough of a threat to put an extra spring in your step. Best of all, despite Hugh Taylor Birch's lying close to downtown Fort Lauderdale, there's none of the disruptive sights, sounds, and smells of traffic.