The 1801 wreck of a British warship on a reef 5 km (3 miles) offshore is a diver's for the non-scuba set there's a glass-bottomed boat you can take to see big groupers and perhaps sea turtles swimming around the sunken ship's cannon.
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You can book a trip on a boat with a glass bottom.
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Sea turtles have been extinct in this region since the 1800s.