The return of Jib

Captain Fermin Luis Ortega has four sailors row me in the ships longboat out to the shallows off the coast of Isle of Sleep. They inform me that I have until the full moon to find the jewel or they will turn me over the Spanish officials. Ortega has told me that should I choose to flee the natives will undoubtedly capture me and subject me to a slow death by torture. I have not been given any weapons, tools or food. As I wade to shore I have few choices.