Carol - Those pictures do look like they came from the same area as the picture on the Green Cay site, but the vllas were not there at the time and I can't give a specific location. But one year the hillside was all brush; the next visit a series of roads had been cut into it; the next they were lined with buildings.
Incidentally, the 02 picture is a duplicate of 01 that got in by mistake.
As for seaweed, it was an accumulation over time and I don't recall any heavy infestation of the sargasum type. Also, it was more apt to dry rather than rot. One year, though, there was a problem with tar balls.