Paris = Tourists
For me, Paris is too busy. It has beautiful monuments, but they are constantly accompanied by pushy crowds and a lot of confused/stressed tourists. They French who live there mostly seem annoyed with foreigners and haven't the tolerance for incompetence. I preferred my visit to Lyon (the second largest city in France depending on who you ask) because it was less crowded, smaller, more open, and the people were friendlier/more patient with my terrible French abilities.
Insider Tip:The metro is easy to use. The ticket machines can be changed to English, French, Spanish, etc. And you can by a day pass that allows you to ride whenever, wherever, all day. For me, I found "Fodor's 25 Best Paris" to be very helpful for navigating the city and choosing what sites to visit during my few days there. The book has a map of the city and the transit system. Don't take a taxi to/from the airport. There are a few trains and busses that take you from the airport (CDG) to the center of the city.