Cabbage Beach, with its 3km white sand, sparking clear aquamarine water and gentle waves has made it onto my top 10 Carribbean beach list.
Near major hotels like the Atlantis, there are designated swimming areas, with life guards and of course, all the tourists. At both ends of the beach, there are quiet coves where waters are calmer and there are almost no tourists.
Take a walk to the east along the beach front and you come to lovely Snorklers Cove. This rocky section provides cover of a numerous colorful fish--but wear shoes or fins--there's sea urchins in them there waters! Keep an eye on those golfers though, there's enough golf balls in the shallow waters to make one a touch wary.
Going west, toward the Club Med beach, the waters are a touch rougher, but better for body surfing.