As of June 9, 2009 a passport was required for just about all travel. Most cruise lines don't require a passport, but you MUST have a photo ID and birth certificate, check with your cruise line well in advance before sailing.
Some states are now requiring a passport to travel to and from them. Check the USA gov't website for updates.
Go to the USA gov't website for travel requirements, information updates and about obtaining or updating a passport:
HOMELAND SECURITY RULES FOR CARRY ON
No kidding folks. The rule of 3-1-1 is strictly enforced by TSA for air travel. All liquids in your carryon for an airplane flight MUST be THREE oz or less, all 3 oz items MUST fit into ONE (1 quart) plastic bag, only ONE BAG per traveler placed in the security bin. Click here for more help with this rule: http://www.tsa.gov/311/
TRAVELERS HEALTH UPDATES
Find out the latest health updates and warnings for worldwide destinations here: www.cdc.gov/travel
SHIP YOUR LUGGAGE TO AND FROM YOUR DESTINATION
Safe and secure delivery of your luggage. Click here to see how: