You need 4WD or you can hike or catch a ride with a local who offers rides in. Usually they charge a fee. It's not a large beach, but when the sun is shining just right, the sand looks like emerald green. Amazing.
If you take a snorkel cruise to the bay the best tour is the "Fair Winds" They serve breakfast and lunch. They have restrooms and it has two slides and it's the only cruise authorized to go there. All the rest of the tours are just rafting boats.