Please note that travelers to and from certain destinations in the Western Hemisphere are required to have a passport or other secure, accepted documentation to enter or re-enter the United States.

For more information please visit http://travel.state.gov and follow the links to "New Requirements for Travel Between the United States and the Western Hemisphere."

It is recommended for most destinations that your passport be valid for 6 (six) months after your planned return date. Some countries require this. 

A passport that is valid for at least six months beyond the completion date of your travel is required for cruises.