Question: do you need a passport for a caribbean cruise?
Answer: You can still cruise to the Caribbean without a U.S. passport if you are a U.S. citizen, but only if you take what is known as a "closed loop" cruise. That means that your cruise ship needs to start and end at the same U.S. port. ... Maarten), and Trinidad & Tobago—will require you to have a passport to enter or exit.