Passport: : For US passengers a valid passport (6 months) or original birth certificate is required to board the ship.
Passport Information links:
Expired passports are not acceptable. (In addition, non-US citizens who have previously been admitted to the United States for permanent residence must carry their Permanent Resident Card, commonly known as a Green Card. Aliens should contact the appropriate consulate to inquire about necessary travel documentation. Each passenger will need a photo I.D.