You more of less answered your own question as to your last night in Italy. Go for broke and hire a limo for the evening. It might be a little expensive but you want to end your trip and go out with a bang. I always use a limo or taxi for special nights. And while on the subject of limo or town car, I always return to the airport in style and use them. Maybe twice as much, some times the same but it's great to arrive at the airport without stress.

Walter