Within Campania the public transport has a unified ticket system called Campania Unico. (http://www.unicocampania....) Tickets are organised in zones which means that with one ticket you can travel within one or more zones. The zones radiate out from the centre of Napoli, and allow you to travel within a zone or between zones, with a maximum time limit for the journey. The idea is that you can purchase a single ticket to travel from a zone outside Napoli to the centre, or vice-versa. Included in this system are generally national trains also to Paestum, the underground in Naples, the Funicolare in Naples, Sita buses along the Amalfi Coast, the Funicolare on Capri, Bus of Ischia the Circumvesuviana that goes also past Pompeii and Herculaneum but NOT ferries. The advantage is not only that you can get tickets for different kind of vehicles, but you could also buy tickets in advance for areas where it is difficult to find a ticket office such as Paestum, as the tickets start to be valid once you stamped them. You should stamp the tickets each time you change vehicle, but be aware that the tickets are only valid for one train, Metro or Funicolare journey. It is possibly also cheaper to buy a bunch of 'one zone' tickets than each time a new one. But careful: some tickets are locally bound (only in Naples, for example. If in doubt, ask when you buy your tickets.
By car
The Amalfi-Sorrento-Salerno road is narrow and full of hairpin turns. Cars pass fast and close. Take care.
By bus
Buses run generally pretty efficiently, but can become full and a bit uncomfortable. Tickets are part of the Unico Campania system, which must be bought in advance. Once exception is the AliBus, which travels from the airport to the centre of town, where you can buy the tickets on the bus.
Along the Amalfi coastline, buses are the only option, with the exception of ferries. The roads are narrow and winding, but the drivers are exceptionally skilled, only usually being slowed down by the less experienced tour bus drivers.
By train
National train lines go from Naples to Salerno and further east and southwards. The Circumvesuviana is a local private train link serving the area around the Mount Vesuvius from Naples to Sorrento. The service has the appeal of typical metropolitan trains connecting to local suburbs including the odd graffiti and cut open seat/window. For tourists this train service is particularly interesting because it is the only reasonable public transport link to Pompeii, Herculaneum and Vesuvius. Note: there are several different lines but ONLY THE BLUE LINE goes to Pompeii, Herculaneum and Vesuvius. Pompeii is in Zone 3 of Campania, and an one way ticket to and from "Zone 3" is â¬2.80. On weekdays all day ticket is â¬8.40 and on weekends all day ticket is â¬4.50. You can use this ticket to get to Pompeii and to get back to Naples. When going to visit the ruins of Pompeii, get off the train at the Pompei Scavio stop. It's about a 40 minute ride from Naples. The entrance is approximately 50m from the station.