The discussion that rjonsun referenced in his original post in this thread started with a comment that I made back when Sandy visited our shores and explains that "wonderful" aroma... It has nothing to do with the sewer pipes which explains why you didnt see them. Here was the original paragraph I posted:

"Every now and then a combination of sea conditions bring on the cleansing of our Caribbean Sea of lots seaweed. This occurred once again last month when Hurricane Sandy passed over the island. Many pics of the seaweed have been posted on various trip reports here on our Negril Message Board. And as anyone who lives by the sea knows all too well, seaweed begins to create a rather vigorous aroma as it decays."

What you were sensing was the rotting seaweed that had been buried in the sand and then uncovered by the sea waves. And when seaweed decays - you now know exactly what it smells like!

Nature at work.... (grin)