329W: Caribbean Island Adventures With Photos

I am looking for a book that I think my parents must have brought back from a Caribbean vacation in the 70s. It was the story of a bunch of island kids, boys and girls of different ages, maybe set in the Bahamas, or maybe not that specific, but definitely in the English-speaking Caribbean. Any adults were marginal background characters. There was a hand-drawn map of their island that showed beaches, caves, meeting places, shortcuts, etc. It was essentially a picture book, but scenes from the story were illustrated with black-and-white photographs of black children (actors? the author’s kids and neighbors?) and island scenes. The combination of an exciting adventure story with actual photography was wonderful.