Passports and visa: U.S. citizens must have a valid U.S. passport at time of entry.
NOTE: Be aware that Caribbean cruises that begin and end in the United States (closed loop cruises) do not require that you travel with a valid passport. However, should you need to disembark due to an emergency and you do not have a valid passport, you may encounter difficulties entering or remaining in a foreign country. You may also have difficulty attempting to re-enter the United States by air because many airlines will require a valid passport before allowing you to board the aircraft. As such, we strongly recommend that you always travel abroad with your valid passport.