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Ever had that tight, ball-like cramping in a muscle known as a Charlie Horse? The more you use swim fins, the more likely you are to get an occasional Charlie Horse. Want to avoid it? Stretch your calves a lot.
Stretch calves before and after you swim. Stretch them while standing in line at a store. Stretch them all the time! Also try eating bananas. Bananas have potassium in them and potassium helps keep your muscles from cramping.
Charley horse: Avoiding is a bit more complicated. You need the right balance of calcium (quite a lot), magnesium, and potassium; lots of water; and replenished electrolytes, some of which can be obtained through sports drinks (or make your own at home with sugar and salt in tapwater).