There are plenty of car hire options on the Neapolitan Riviera, with a number of pick-up and drop-off points spread around the coast and in Naples. Some of the best car hire companies include:
Avis (081 780 5790, 081 751 6052, www.avisautonoleggio.com); BudgetItalia (081 789 9038, www.budgetautonoleggio.it); Europcar (199 307 030, 081 780 8354, 081 780 5643, www.europcar.com); Hertz (081 780 2971, 081 780 5681, www.hertz.com); Maggiore (081 780 3011, www.maggiore.com); and Sixt (199 100 666, www.sixt.it).
However, there are plenty of reasons not to drive in around the Neapolitan Riviera (security, narrow roads and parking being the main reasons). I'd recommend that visitors take the bus, or better still, the boat.
There are also plenty of reasons not to drive in Naples: the fact that only vehicles with catalytic converters are allowed into the city between the hours of 8.30am and 6.30pm; there is a Blue Zone within which only residents can drive between 7.30am and 6.30pm (Mon-Fri); no vehicles are allowed to drive around Spaccanapoli between 10am and 10pm, and all vehicles are banned on many Sunday mornings. Then there’s your fellow driver… and the issue of security …
Driving along the impossibly picturesque Amalfi Coast road looks better on film than the reality; it's a nerve-wracking, knuckle-whitening roller-coaster of a ride negotiating tourist buses and crazy Vespa riders.
Non-resident cars (and motorbikes) are banned from the island of Capri for most of the year (from spring through to autumn) but once you arrive you can make use of boats, buses and cable cars. Taxis (lovely open top versions too) are also a (more expensive) option.