If you do the museum pass, be prepared to wait in line. Hell, be prepared to wait in line at any tourist attraction. I went to Europe during the "off season" (Feb? March? Something like that, anyway lol) and managed to luck out when we went to the Louvre (no line up), but the Eiffel Tower had a line so long that we almost didn't do it. Don't forget to check out Versailles while you're in the area.
In Italy, avoid the touristy restaurants. Generally speaking, the food is only "okay." If you want a true Italian cuisine experience, seek out the tiny hole-in-the-wall restaurants. In the Cinque Terra, if you find yourself in Riomaggiore, check out La Lanterna. Or, in Monterosso, try La Cambusa. If you find yourself in Venice, go to Osteria Boccadoro (
Ostaria Boccadoro). I seriously had the absolute best meal I've ever eaten there.
In Paris, try to get a table at the Restaurant Guy Savoy. It's near the Arc de Triomphe, so a good natural stopping point to grab some food. The food is also fantastic. Easily beats anything you can find in Vancouver.