Photos by location:
This is beautiful Cinnamon Bay. We chose to hang out on the beach at Little Cinnamon Bay, just a short (only slightly difficult) hike from the campground. Because of the hike, Little Cinnamon is much less visited. Except for a few snorklers, we had the place to ourselves.
You can see rocks and coral under the water just off the right side of the beach. Good snorkeling there (pics in this set).