It's nearly always less expensive to pre-book a car from your home country than it is to book once you get to Italy | Most tour reps will advise you not to use local buses, but I've never had any trouble using them (as in most countries keep a close eye on your luggage and possessions) |
There is an excellent train service, just remember to use the machines in the railway stations to stamp your tickets BEFORE you get on the train | Official Train Timetables for Italy |