Puerto Rico has long been synonymous with an easy, no-passport-required dose of sun and sand. But the island is more than just pristine white sand and shimmering turquoise waters. Puerto Rico also has a rich imperial history, a vibrant culture and culinary scene, and verdant jungle-clad peaks that rise some 4,000 feet above sea level. Here, your 36-hour guide to hitting the island’s hot spots, historic sites, electrifying rainforests and, of course, tropical beaches.