NOTE: The only way to enter St. Lucie State Park is by foot or boat. No freshwater is available so bring as much as you need!
Park at Hobe Sound National Wildlife Refuge. Hike North on the beach to the inlet. There are a few trails that follow the beach once you reach the St. Lucie State Park Boundary. Return to starting Location.
http://www.tripleblaze.com/trail.php?c=3&i=1851