Pack Only What You Need
When traveling to a foreign country, knowing what to pack can be a challenge. A good rule of thumb is to take the time to leave behind anything you would hate to see lost or stolen like expensive jewelry, your Social Security Card, and unnecessary credit cards.
However, you should bring your current passport and other accepted forms of identification.
As of January 2009, U.S. citizens entering the United States at sea or land ports of entry are required to have documents that comply with the Western Hemisphere Travel Initiative (WHTI), most commonly a U.S. passport, a passport card, a trusted traveler card such as NEXUS, SENTRI or FAST, or an enhanced driver’s license.