Whether you need a passport for MSC Ocean Cay (the line's private marine reserve in the Bahamas) depends on your citizenship and your cruise's starting point. For U.S. citizens on a "closed-loop" cruise—one that starts and ends at the same U.S. port like Miami or Port Canaveral—a passport is strongly recommended but not strictly required by law. You can instead use a government-issued photo ID (like a driver's license) paired with an original or certified U.S. Birth Certificate. However, MSC and travel experts advise carrying a passport in case of an emergency that requires you to fly home from the Bahamas, which does require a passport. For all non-U.S. citizens, a valid passport with at least six months' validity is mandatory. In 2026, having a passport remains the premier choice for frictionless boarding and peace of mind during your Bahamian island escape.