No passports are necessary to visit this exotic Caribbean island. Year-round sunshine, pristine beaches and an array of activities make Puerto Rico an ideal family vacation. In picturesque Old San Juan, families can explore historic forts, grab lunch in a plaza and visit museums. Getting around in the popular tourist areas of San Juan, Condado, Miramar and Isla Verde is a snap with public transportation.<br/><br/>(Mimi Slawoff is a family travel writer and a Caribbean travel expert.)