Originally Posted by rickg523

With the Freccia trains, you can visit Naples as a day trip. So splitting your week is very do-able.
Right from the airport, if you time it out right, you can take the Leonardo Express from FCO to Termini and a Freccia train from there to Naples and be in Naples in about 2 hours. Travel time is about 30 mins on the airport express and about an hour on the train. 30 mins cxn time is plenty.
As for quick-hitting Rome, stay close to the Pantheon and all of the main sites - ancient Rome, Pza. Navona, Trevi, Spanish Steps, Campo di Fiore, the ghetto, Trastevere - are within 30 minutes walk, many within 10 minutes. And the walks are great in themselves. The streets of Rome, despite crowds and tourists, have been charming visitors for millennia. Don't be surprised if it happens to you too.