Some people go to the beach but eschew going into the water because it's "gross". If that's you, then you are a sucker. According to a new US EPA study, playing in the sand more than doubles your chances of getting sick.
Last march when the Fukushima-Daiichi nuclear plant was disastrously damaged by a tsunami, plant technicians used seawater to cool the meltdown situation. At the time, that was probably the best way to avoid an even worse situation.