I just got back from Margarita. Here's my advice - if you're booked to go you should find a way out - if you can't get your money back then write it off and don't go and avoid the misery. This place has a major problem and I suspect the ocean water is a big part of it. My buddy and I were to be there for two weeks. We lasted one week and were fortunate to get tickets off the island after the first week. It cost us an extra $250 U.S. each for the tickets and worth every penny. Everyone who was windsurfing was sick - stomach problems - vomiting or the runs or both. This is a very tough way to lose that little extra weight - avoid this place at all costs. There's a long thread about this problem over at www.boards.co.uk
in their General Forum. Apparently travel agents and windsurfing travel companies are pretending this isn't happening. Shame on them!
You've been warned! I just wish I had been.