Years ago I visited Cozumel Island off of Cancun.At the southern tip there is a lighthouse. At that time, it was manned by one family (one exposed light fixture, dirt floors and hammocks for beds. We made a deal with the dad; he would provide lobsters and we would provide the beer and tequila. Deal was made and a memorable (40 years ago and counting) meal was enjoy by all. But I digress......Years later, a close friend told me he had just returned from that same location, had met the old man who--after a while-- showed my friend a rain barrel topped off with Spanish coins found on the beach and in the sea. Neither my friend nor I have returned to Cozumel. You may want to do a little searching in that area if you get over to Cozumel.
Don.........