One day
Start early at El Morro on its headland, then wander Old San Juan's blue-cobbled streets, the city walls and the Paseo de la Princesa, the cathedral and La Fortaleza, and Castillo San Cristóbal. Have a mofongo lunch, then spend the hot afternoon on Condado or Isla Verde beach. Return to the old town for a sunset on the walls, a piña colada, and dinner and salsa on Calle San Sebastián.