FLASH !!! Update! I have just read Paris for Dummies (see adjoining display) and I hesitate to put it up in this blog because it TELLS EVERYTHING you need to plan your trip. (I have a few things they don't)
Go to the Amazon site and read the reviews of this great book ("with tips and recommendations form the experts at Frommer's"). You can always look at the pretty photos in other books (this book has only practical info)-and you could do it free at a bookstore. But this book is to be dipped into, studied, though over before and during your trip.
On p. 109 the author, Cheryl A. Pientka, tells you what to do if you arrive without a reservation. (I once did that in Hong Kong and I think I got the last room available in that giant city-it was the weekend of the Grand Prix of Asia. It makes sense: you go to one of the Tourism Offices of the city-in the Gare de Lyon, the Gare du Nord (gare=railway station) or the Opera-Grands-Magasins welcome center. BUT!! more than that, by going to these places you can find "rock-bottom" prices such as 3-star hotels at 2-star prices. They can also get you a room or bed in a student dormitory. The charge for the service is from $1.40 for dorms to $7 for 3-star hotels. Not much to pay to shave off a lot of money per night. (I've used these Office of Tourism in southern France and they work like a charm.)
In the early sections of the book there's great brief introductions to Paris history, food, air security, special interest traveling, including many resources for gay and lesbian-friendly travel businesses, as well as tours and books.
There's plenty of info to help you maneuver the gigantic and complex Charles de Gaulle airport and a number of all-you-need tourist maps.
Get it! Paris for Dummies