Why not enjoy a day in Cadiz and travel by Catamaran from El Puerto de Santa Maria or rota to Cadiz, or of course visit the Rota and El Puerto if you are staying in Cadiz.
its a short journey and the Catamaran stops in the very centre of the old town of Cadiz, allowing you to walk around the narrow streets, visit the fantastic market or even spend the day on one of the magnificent beaches Cadiz has.