When one takes a Disney Cruise, one can go here, Disney Isle. It has another name, but this one sounds good to me.
Nice lagoon and a seperate beach for folks wishing to get awayfrom the yung'uns. Sand seemed to be made of crushed seashells. The water was a bit colder than I had expected, but quite temperate.

Picture composed of around 20 seperate photos and stitched. The full version is made of 54 photos and shows the barrier atol to the left in competeion. No real room on the net for it.