The tourist bus links all the main attractions including the Equestrian School, the Alcazar, the Cathedral and the Bodegas. There are eleven stops on the circular tour. A good starting point is Plaza del Arenal.
Tickets are valid all day, so you can hop on and off as you please.
After reaching Jerez, i took a bus of Linesur company to Seville. The bus was in a good condition and the trip was 1 hour 10 minutes. The one way ticket was 5.7 Euros.