There are a few options. As I understand it there will be a card that can be used in Canada and some Carribean areas when traveling surface transportation. If traveling by air a passport book is required. In addition some states will offer a License that is "enhanced" that can act as a passport card. When I came back into States they gave me a flyer explaining it, so I'm sure you'll be able to find details on line at the Homeland security website. The Post Office would be the best bet for local contact, the cards are less expensive if you don't plan to fly out of the country ever.