Another tip which can become crucially important. Learn how to say the name of the port of Rome...CIVITAVECCHIA.
On a recent cruise 2 English ladies were late getting back with the train so they grabbed a taxi and asked to be taken to the PORT (they didnt know the name )
The driver took them to the Airport instead and they missed the ship's departure even if the captain waited an entire hour.
They took a plane from the airport to Sardinia, Alghero where they caught up with the ship.