Ride the RER B Train from CDG to the center of Paris (with a single RER ticket)
Buy a pack (“car-nay”) of 10 individal Metro tickets for daily rides in the city
(or use a weekly Metro Navigo Découverte Card from Monday through Sunday)
Ride a Vélib’ bicycle to experience Paris from a new perspective
Train rides are free from late afternoon New Years Eve through New Years Day
(so it’s a free ride back to the Airport)
Fly to Paris
Train into Paris (RER Trains)
Paris Metro (Subway Trains)
Bicycle Paris
Run Paris
Paris on Foot
Vélib’: Paris Bike Sharing System
Know Before You Go (National Geographic: Intelligent Travel)
Paris Memos (mailing list)
Waiting List 
Paris for the Holidays 