This airy 4.5km walk takes at least 1¼ hours. Go north from Plaza de Mina to the city's northern seafront, with views across the Bahía de Cádiz. Head west along the Alameda gardens to the Baluarte de la Candelaria, then turn southwest to the Parque del Genovés, a semitropical garden with waterfalls and quirkily clipped trees. Continue to the Castillo de Santa Catalina, built after the 1596 sacking; inside are an interesting historical exhibit on Cádiz and the sea, and a gallery for exhibitions. Sandy Playa de la Caleta (very crowded in summer) separates Santa Catalina from the 18th-century Castillo de San Sebastián. You can't enter San Sebastián, but do walk along the breezy 750m causeway to its gate. Finally, follow the broad promenade along Campo del Sur to the cathedral.