I assume you're referring to the Atlantis Paradise Island Resort in the Bahamas. You might get more responses posting on the cruise board, although I think most
DCL ships sail before sunset.
That being said, the Atlantis resort itself is probably safer than most of Nassau. It's once you step off property into a cab, things may get dicey. Have the driver stay to the main roads and drop you in well populated areas.
MY two cents, Steve
