One day
Start at the Mercado Grande with a coffee, enter through the Puerta del Alcázar, and walk a long stretch of the ramparts for the views. Tour the fortress-cathedral and the Convento de Santa Teresa, see the Basilica of San Vicente just outside the walls, and have a chuletón lunch in a granite tavern. In the late afternoon, walk across the Adaja to Los Cuatro Postes for the sunset panorama, and stay for the floodlit walls if you can.