Don't breathe the water.
It was just before noon. My brothers had just come back from driving little water scooters around on the ocean, one brother trading places with our close friend on the lounge chair in our beach shelter tent. Three of us went to the shoreline and began swimming for the edge of the swimming area, a floating rope out in the ocean about 50 yards from shore. This is nothing out of the ordinary, it's a swim we do every time we go to this beach island. Surrounded by hundreds of other tourists playing around in the water, the 100 yard swim isn't a race, it's just a fun little thing we do. Today the sea was a little more rambunctious than usual. Nothing serious. No whitecaps or actual waves, just bumpy water with swells maybe a foot tall. The waves came all the way up the beach to the first row of loungers. Partly cloudy and warm, it was a good day for a swim. So swim we did. My brother and friend were perhaps 15 yards in front of me as I took an extra moment to take a pict