The festive city of San Juan is the perfect place to experience Puerto Rican culture. Get to know its roots by exploring the vibrant neighborhood of El Viejo San Juan (Old San Juan), which consists mostly of Spanish colonial buildings. Flesh out your self-guided history lesson with a visit to El Castillo San Felipe del Morro, a 16th century citadel that’s a UNESCO World Heritage Site. Then head farther afield to take a cooling dip at Luquillo or Carolina Beach or a tasty tour of the Bacardi rum plant.