This is the hike Willy and Dave did several years ago. A point of interest is that much of it was built by Timucuan native-Americans from oyster mounds. These were built long before European conquests of the 16th century. Today the hike was undertaken by Roxane, Katy and myself.
Here are some maps:
Notice that part of the hike is nearly 6 feet below sea level.
More… here is the full photo gallery of todays hike: