All beaches are public in the Bahamas, and detecting is allowed, I was there last year on a Cruise Ship and went over and hunted behind the Atlantis Hotel. I have a letter from Basil Rahming, Chief Superintendent of Police, 2nd.I/C grand Bahamas& Northern Bahamas.
It reads,
Please be advised that there are no laws prohibiting the use of a metal detector on public beaches. All beaches are public below the high tide water line.
I had a security guard from Atlantis tell me I was on private property. I told him Mr. Basil Rahming chief of police says not. He told me to have a nice day.
Good luck and HH