You will need your sign n sail card in the bars, casino to purchase drinks. It is also your room key as well. Your SnS card has your ID age in it, so no other ID is needed on the ship, though I carry my DL as well, cause I look young for my age, and my DL is also the magnetic caard that opens my room safe, so I take that with me as well. Then in port, I carry my SnS card (you need it for your room, and to get off and on the ship) and my passport. I never take a chance in a foreign country of traveling without a US passport. It leaves the ship with me.
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