Visas are usually not required in the Caribbean, but some countries may require you to fill out a tourist card. Each island has specific guidelines on what you can bring in with you.
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Puerto Rico. Located about two and a half hours from Miami, Puerto Rico is situated in a pocket of water between the Atlantic and the Caribbean. Since Puerto Rico is a part of the U.S. commonwealth, there is no visa or passport requirement for U.S. citizens.
Entry, Exit and Visa RequirementsU.S. citizens must have a valid U.S. passport to enter Barbados. No visa is needed for stays up to 6 months. NOTE: Generally, all U.S. citizens are required to present a valid U.S. passport when traveling to Barbados, as well as proof of anticipated departure from Barbados.
Some nationalities can travel to St Lucia without a visaResidents of several countries, including the United States, Canada, Australia, and the United Kingdom, are allowed to enter St Lucia without a visa for up to six weeks.
The CDC and WHO recommend the following vaccinations for Barbados: hepatitis A, hepatitis B, typhoid, yellow fever, rabies, meningitis, polio, measles, mumps and rubella (MMR), Tdap (tetanus, diphtheria and pertussis), chickenpox, shingles, pneumonia and influenza.