Photo courtesy of Stephen Lovegrove
There has been a bit of a debate over whether or not the woman next to Charlie (with her straps down) is May. I believe that it is. Her body shape, her long nose, and her short, dark hair, all resemble May, in my opinion. Plus there are other photos of May with her bathing suit straps hanging down (here and here).
I have not been able to ID the other people in the photo.