Personally, I'd go with pirates - not just a general statement!
Intro with the film trailer, introduce the landscapes and major features of different islands - perhaps with pros and cons for piracy. Maybe do a pirate map themed 'drawing from dictation' where you describe a map, with rivers, mountains, forests, nodes, prepositions, etc., and the students have to listen and draw it all down, (and then compare with your original image).
Then have the students imagine that they are pirate captains and have them design the perfect Caribbean island - with labels, and a written description. Have a couple of the more imaginative ones present to class at the end.