The facts:
1. Cozumel can dock 7 cruise ships per day. It's infrastructure can handle up to 13 with an average passenger load of over 2000 per plus large numbers of crew. Oasis will visit Cozumel every other week during the low season. Her crew to passenger ratio is less than most other ships. Yesterday, when the Oasis was in, there were 3 other ships in port and one was a small Carnival ship. If we count Oasis passengers and crew as 2 ships, the number of people being served is still well within normal ranges. And many people here are able to continue working and earning a living during low season due to this ship's presence.
2. The number of rental vehicles, taxis, and people who may use Coz's waters is finite. I didn't see any overcrowded streets or extra masses in the water due to this ship. Melgar in front of the SSA pier was tied up by rubberneckers who wanted to see the ship, but traffic flow wasn't stopped. Most of the passengers went on excursions, to nearby bars, or stayed within the pier complex. A few went to town. No different than any other day, except for fewer cruisers around in total due to seasonality. I don't get the Wilma reference at all...
3. Excess trash: As far as from the ship, no. The ship was designed to significantly reduce its environmental impact and has containment, treatment and recycling facilities. On land, there are always those who drop trash -- but most are either locals or drunk and the city has a huge force of street sweepers to follow and clean up. (Employment!) Island cleanliness is very important to the government to encourage tourism. And it has improved vastly over the past 5 years.
4. Water use: Yes, our sanitation system is overburdened and every flush counts. It's up to the municipality to handle that one. The aquifer is in great shape after recent downpours and we're coming into the rainy season, so plenty of water is available.
5. Paradiso North, unfortunately, was sacrificed for commercial purposes long ago and continues to be mangled bit by bit. It's a cryin' shame, but the damages were due to economic & political imperatives that overruled protectionist concerns. The Puerta Maya and TransCaribe projects -- and the sand dredging in the north -- are personally very offensive but I can't put the blame on the companies or ships that use facilities once they are built.
Finally, Oasis passengers are affluent and it's hoped that they will help an economy in the doldrums. That's a very important and laudable thing if the gamble pays off. One of the best things that can be done for Cozumel's environment is to increase the affluence, education and influence of its citizenry.