A couple of ideas. There is a little resturant overlooking the "Spanish Steps" and it is fun to have lunch and watch the people. The On and Off bus in
Rome is perfect to see the city and not spend a fortune on taxi's. If you are going to drive a good trip is to Florence and then to Milan and over to Venice. If you want to land for a few days it would be fun to rent a Vila in Tuscany for a week. You can get some at a very reasonable rate and then tour the area and the hill towns. Another great trip (maybe take a tour) is of the Almalfi coast. It is beautiful and quite a trip. Be sure to buy a map of Rome in Barnes and Nobel and study the city before you go there. We always got a kick out of watching or hearing tourist's stand on a corner, etc and try to decide what to do next. All of that planning (sites to see, best way to travel, tours) should be done before getting on the plane. Just some ideas..
I know you'll have a great time and trip..