Hi, I am italian too, I'm writing from Tuscany. I agree with what the others said: train is the best solution to move from a place to another, absolutely don't take the plane!
I think you should visit the center and the north too: You can't go away from Italy without having visited Rome, Florence and Venice.
But overall, while you're visiting the south, BE CAREFUL and pay attenction to thieves, swindlers and other little crimes, because being robbed is very easy, expecially if they're dealing with foreigners.
Hi Giammarco, any tips for staying safe from petty crimes? I heard pickpockets are in abundance. I would want to do cliff diving and other wet activities in certain parts of italy. Is it safe to leave my passports/important docs/money in my place of lodging?
Also, as a backapcker, i will be looking for backpackers inn, and do i have to book these before hand or just go there and hope for an open space?