Do you need a passport to travel on a cruise to the Caribbean?

I am planning a cruise to Puerto Rico, St Maarten, and St Thomas, will I need a passport?

Yes

http://www.carnival.com/CMS/Static_Templates/EMB_travel_document.aspx

If you are disembarking in any other country other than your own you will need passport even for one day

Yes. St Maarten is Dutch and French so a passport is required to go there.

Yes

i belive the regualtions now call for a passport also for a cruise, getting one is a bit costly about 150.00 and the waiting period is anywhere from 6-8 weeks so plan ahead, my husbands literally came 2 days before we left, st thomas and st martin are absolutely beautiful, have a great trip. also this goes into effect after jan 31, 2008 good luck have fun

yes

You do as of 1-31-2008

I just got home from that same trip... it was great..

join the best cruise group on yahoo

http://groups.yahoo.com/group/Cruiseaddict/

No
and there will be a new Pass Card instead

there is the page that tell all about it right from the government itself:

U.S. citizens may begin applying in advance for the new U.S. Passport Card beginning February 1, 2008
http://travel.state.gov/passport/ppt_card/ppt_card_3926.html

yes, as of 2008, passports are needed for all cruisers.