At the other side of the bahia, is famous for a few things.
The wine, the horses races at the beach in summer and also for being the start point of the Romeria del rocio, as crossing the river you enter at The Coto de Doñana.
Not far from Cadiz (about 100 km), in Tarifa, you can go on a boat for whale watching, to see (well, to try at least) whales, dolphins, sperm whales...
They offer daily excursions on the strait of Gibraltar, from where you can see the african coast too.
Glass bottom boats.