Having once been fully uninhabited, this petite island of perhaps 50 feet wide and 150 feet long now has a population of one—a middle-aged caretaker named Del Ray who guards and cares for the small facilities while watching over the adjacent protected reef. …. Using rain gutters on their roof, the runoff is channeled into large water storage tanks—tanks that are very similar to those found on the roof of most homes throughout Cozumel and the Yucatan. …