CDG Airport is 25km from central Paris.
Taxi - licensed metered taxis operate from outside the Baggage Claim area exits of Terminals 1, 2 and 3. They can be identified by their illuminated roof signs. You're strongly advised not to accept rides from people who approach you in the airport.
Bus - the RoissyBus connects CDG with Paris Opera Metro station - it stops at all 3 terminals. Numerous other buses also serve the airport, offering connections to the surrounding region.
Trains - the RER B regional rapid transit line has stations between Terminals 1 and 3 and south of Terminal 2. Trains run every 10-15 minutes to downtown Paris. There's also a TGV (high-speed train) station by Terminal 2, offering direct long-distance services across France. You'll find a couple of convenience stores and coffee kiosks in the station on level 2.
Hotel shuttle - many nearby hotels can be reached by free bus shuttle or on the CDGVAL free automatic metro that serves the airport grounds.
Car rental - car rental agencies are in Terminals 1 and 2.