I talked to local fishermen and they told me so.

some were very mad at the cruise ships, and cursed them on the days they came. when we went out diving or snorkeling, the guides told us the best locations were the ones that the cruise ships wouldn't go, because lots of the passengers from cruise ships broke the corals because of carelessness, and some took away corals.... also when i was in San Juan when a cruise ship came to port, i encountered some very impolite passengers. so i had some bad impression of the Carribean cruise ships and passengers.