Traveling to Grand Cayman with just a birth certificate is generally only permitted for cruise ship passengers who are on a closed-loop cruise (departing and returning to the same U.S. port). Even then, you must also present a government-issued photo ID. However, if you are arriving by air, a valid passport is mandatory for all travelers, including infants and children. In 2026, the Cayman Islands Department of Customs and Border Control strictly enforces this policy to ensure security. It is also important to note that if you are a cruise passenger using a birth certificate, you could be stranded if an emergency arises and you need to fly home, as airlines will not allow you to board an international flight without a passport. Therefore, while legally possible for some sea travelers, a passport remains the most secure and recommended travel document for everyone visiting the islands.