Many people in the world may not know that Puerto Rico is part of the USA. Even though it's not a state, it's a U.S. territory. So if you aren't a U.S. citizen or U.S. permanent resident, when you visit Puerto Rico, make sure you have the valid visa or passport that grants you the permission to enter the USA. Puerto Rico is a beautiful place that has very distinctive culture and architecture, and it's one of the stops of the 7-Night Exotic Eastern Caribbean Cruise with Carnival Breeze (Starting at $499/person).