That's a tough one to answer... it's difficult to predict the weather that time of year.

Last year, the entire month of March was warm and sunny. Years past have seen cooler weather.

The water temp is usually still a little cool, but as long as the sun's out and the air temp is up, it's enjoyable.

At the very least, you'll all be able to wade in the water and play in the sand. You might want to find a hotel with a heated swimming pool if you're set on doing some swimming with the 2 yr old.