A little more than a two-hour flight from the continental U.S., Puerto Rico walks the line between American territory and international charm. A blend of Spanish, Indian and African influences, this island has tropical forests, plenty of white-sand beaches and an ever-expanding dining and nightclub scene. When you visit Puerto Rico— aside from taking a ferry trip to the pristine beaches of Culebra or the glowing waters off Vieques—you can otherwise cover the whole island by car with day trips. Old San Juan is like a time-capsule with blue cobble stoned streets, pastel colored buildings, and great cuisine. While visiting Old San Juan, a must-see is the formidable Castillo San Felipe del Morro, which is a 16th century fort built by Spain.