My knuckles turned white as I gripped the metal bar. The floor beneath me dipped suddenly, slamming me into the railing that provided my only means of staying upright. My hair, whipping around frantically, clung to my eyes and mouth. Blinking in a futile effort to get rid of it, I squinted at the bright horizon. Against the convergence of turquoise water and cerulean sky, a brown hump was steadily growing larger. It was Dry Tortuguas National Park, one of the strangest parks
