I was recently in Cancun at a destination wedding for my nice. We went snorkeling off the coast of Cozemel and discovered... hundreds (really close to 1000) jellyfish swimming around us. Our guide said they would not sting us, but he was WRONG! They were beautiful, translucent purple from quarter size to 4 inches across. They float on the surface and you can't even see their little stingy tentacles! Luckily pouring fresh water over them (no, no one had to pee on my legs!) took most of the bite away!