Hailing a taxi is practically unheard of in Naples. Your best bet is to call Radio Taxi or ask someone at your hotel to book one. Taxi ranks can be found outside the central Piazza Garibaldi train station and the port (Molo Beverello), but there are few anywhere else. Watch out for overcharging at three locations: the airport, the railway station, and the hydrofoil marina. A taxi from the airport to the central station costs €37 euros, this covering three people, two large pieces of luggage, and two small pieces. City Airport Taxis has information about fees to other destinations within and near Naples.
Taxi trips around the city are unlikely to cost less than €10 or more than €20. You can pay a fixed price or ask for the meter to be switched on; the latter often results in your paying less. Other options besides Radio Taxi include Consorttaxi (081/5525252), Cotana (081/5707070), Free (081/5515151), and Napoli (081/5564444). In summer, most cabs in Naples have no air-conditioning—which the city's buses and metro do have—and you can bake if caught in a traffic jam. Taxis charge approximately €3 initially (more on Sunday and holidays), then €0.05 per 65 meters or 10 seconds of idling.
City Airport Taxis (Naples, Campania. www.city-airport-taxis.com/airporttransfers/city/Naples-taxi.)
Radio Taxi Napoli (Naples, Campania. 081/5564444.)