EXACTLY!!! Like I said, we spent the whole day at the Louvre and sat out in the beautiful park that surrounds it. Ate crepes from street vendors, walked up Champs Elysees and to the Eiffel Tower and Arc of Triump.
Took the subway to the colliseum in Rome and wandered the streets. Ate gelato on the steps of the Trevi Fountain.
Sit on the steps in back of the train station in Venice and people watch. It's awesome there. Also make sure you hit St. Mark's Square at night. All the colored lanterns lit up is so awesome. Plant yourself at a cafe and sample some gelato with liquor.
If you want an awesome view at sunset, take the 17 hour ferry from Greece to Italy. It was so magical being totally out of the sight of land.
If I think of anything else, I'll be sure to post again. Good luck and have fun. It was the most memorable trip of my life.