An informative guide and more that 180 € discount. Individual attention. The only one bus with official 'Turisme de Barcelona' speakers.
Daily service (except january 1st and dicember 25th). About 2 hours of tour (except the green one: 40min.) Schedule: Winter 9AM-7PM / Summer 9AM-8PM. Check out more detailed schedules in the bus stations.
You can find them in the bus, hotels, newspaper shops, book stores, Tourism attention and 'Turisme de Barcelona' points.