You love to relax with friends and family, but you have to keep fit, too. A long power walk with others on the beach lets you connect while you work out. You love the water, so you might like water aerobics, too.
Deep end or shallow, outdoors or in, there are group workouts to suit every ability, without the pounding or joint stress of running or weightlifting.
For a more solitary activity, swimming laps will build your endurance in a quiet, almost meditative environment. Add motivating tunes on a waterproof MP3 player to make the time fly.