flying into DeGaulle & taking TGV from airport to Aix?

Everything is in English; and everyone speaks English for your needs at the airport.
Just always say Bonjour before anything else.

The food options are good. No one knows what you like to eat, how much money you want to spend, or what you can not eat so I would research this from this list of restaurants and then ask about any that catch your eye:
http://www.parisaeroport.fr/en/passengers/shops/restaurants-bars

This site may help you to get to the train:
http://easycdg.com/transport/tgv-train-paris-cdg-airport-charlesdegaulle/

Oh and it probably stops at Avignon before Aix. So that is a good way to know. But the TGV also has a display in each car that says what the next stop will be.

Here is a link to the airport terminals and where the station is located (bottom/basement/underground/lower level): http://www.parisaeroport.fr/en/passengers/access/paris-charles-de-gaulle/terminals-map
http://www.parisaeroport.fr/docs/default-source/passager-fichiers/acces/edito_plan_sncf_cdg-pdf.pdf?sfvrsn=2

Here is an interactive map throughout the airport as well: http://devaccess.itiview.com/itiview/index.php?project=1127

Note that if you are travelling by TGV it will call at the high-speed station for Aix, which is a long way from the actual town. There are shuttle buses to meet the trains, but you will need some cash ready to pay - the fare is 4 euros 30.

Very helpful. Thanks to all for the detailed and quick responses. Any idea of approximate cost of taxi from Aix TGV station to Aix regional station (my hotel is very close)?

No need for a taxi - the shuttle bus arrives at the Aix bus station which is close to the regional railway station.

No need for a taxi...

Ah, but then one misses the taxi experience. One of my first few visits to the Aix TGV station involved a taxi ride to an industrial site near Vitrolles (SW of Aix and NW of Marseille) for an important meeting. I had a partially obscured view of the speedometer, but I know the driver hit 150 km/h and I believe he sprinted above 160 for a bit. His Mercedes was surprisingly quiet at that speed. I think I heard the sweat popping out on my forehead.

The bus shuttle from the Aix TGV station into town may be included in the train ticket price. Shopping on the SNCF site, choose the trains from Paris that list one connection; that's actually the bus, not two trains. SNCF sells flexible tickets but at a higher price and changing the time of departure will involve dealing with an agent (and probably a line-up) at the airport since the seat assignment will change.

I have done a similar trip more than once, arrive CDG late morning and take the TGV to the south of France. Four hours is plenty of time, I give myself 3.hours. Presuming your flight is on time the time will allow you to take a breath and REGROUP before getting on the TGV. One of the first things I do is get euros from the ATM machine. Then I can sit and savor a cafe au lait. The maps are okay for directing you in the terminal to the TGV station. Then I walk to the TGV area, If I remember correctly, there is a snack place and restaurant nearby. A place to watch other travelers and begin to accustom your ear to hearing French.

The first time I did this trip, I studied carefully the online maps of the airport. CDG can become crowded with travelers moving quickly, think BWI or Atlanta. By spending the time learning the layout, identifying where the ATM machines are, and the TGV location and the route through the airport to it helped me feel in control even though I was exhausted. If I remember correctly, its been 5 years, you need to go down one or two floors to get to the TGV counter and platforms. The maps clearly indicate its location. Also the airport website gives helpful information.

As this is your first time to CDG you may want to identify the arrivals terminal your airline uses and write out the directions from arrival to TGV and keep them handy for when you clear customs. This will also help reduce panic if your 4 hours gets reduced to 1.5 because of delays.

I prefer to buy my TGV tickets before departing the US, (sncf.com) usually I can get first class tickets at a cost slightly more expensive then 2nd class. This is a treat for me, but after a long over nght flight (13 hours from west coast) a little pampering is in order. The first class compartments are usually quieter and allow me to get a few cat naps before I arrive at my destination in the southern part of the country.

Also, Before leaving CDG I break my euros into smaller coins/bills and put a few in an easily reached place to buy coffee on the train and pay for the bus or taxi at the other end.

Have fun, I will be doing this route to CDG to Arles in August , it's easy!
Julie