Although the fish swimming around wont hurt you, some ponds and lakes may hide jagged rocks, broken bottles, or trash. Wear something to protect your feet. Also, watch out for weeds and grass, which can trap even a good swimmer. If you panic and try to yank yourself free, you may get even more tangled. Instead, shake and pull your arms and legs slowly to work yourself loose and call for an adults help.
If youre going out on a boat, always wear a life jacket. Again, the life jacket should be Coast Guard approved. Even if you are a good swimmer, something could cause the boat to tip over and you could be trapped underneath.