Buy the pass at the airport (CDG) use it (If you don't have too many bags), to get into the city, maybe even your hotel. Then use it to get around town. Likewise, it will get you discounts on a lot of other venues.
You can use your credit card to buy your pass. Just remember to use it when you before you get on the train and again when you get off.
Yes, see Paris on www.elitepro-travel.com
The Paris Sightseeing Pass for sightseeing to most Paris tourist attractions are free with the Paris Pass.
I bought a one day pass at the bus stop at the Eifel Tower. with the PARIS MUSEUM PASS, you gain free entry, without queuing and as many ... Buy your pass on your arrival at Paris Charles-de-Gaulle airport . See the Paris museums and the interesting sites with one pass, and NO WAITING in line! Unlimited visits to museums and monuments in Paris and in the surrounding Ile de France.The 2 day pass is about $50 called a Museum Pass with unlimited Paris Museum Entrance to 60+ sites! See the Paris museums and the interesting sites with one pass...
Other Paris threads to check
http://www.rewards-insiders.marriott.com/photoAlbums/1101 La Défense, Paris, France
SusanL (Renaissance Vendome)
Thanks & CDG to Renaissance Le Parc Trocadero (Renaissance Le Parc Trocadero)
Paris! "Never better!" (Arc d'Triomphe trip report)
Surprise (discussion on Paris sights & hotels)
Hotel and Metro in Paris (hotel airport transporation options)