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I hope some of you can help me.  I have a good friend wanting to book asap on the Carnival Liberty, Eastern Carribean.  Her 25 yr. old daughter is traveling with a birth certificate/drivers license.  My friend was wondering if the various ports require you to show a passport or birth certificate leaving the ship or getting back on board?  I've only cruised to Mexico and I had to just show my sail and sign and my drivers license.

Thanks for the help,