Sarahjayne07- there are a few photos of "beach building 3" on the Official thread. It's just listed as the "beach location". Unfortunately the photos are from an evening event, so a bit difficult to get a real feel for it.
If I remember correctly, there is a stone ramp leading down to the beach on the right side (if you're standing in front of building 3 looking to the ocean). They set up an area, between the palapa beds and on the sand.