Getting to DLP from Paris/Four Seasons area?

[Jenn]

We are heading to Paris for the first time in 2 weeks and staying at the Four Seasons George V for 5 days, then we need to get to DLP for the last 2 days of our trip (and then back again to head home).

What is the easiest way to get there and approximate cost? Laymans terms please because we have never been to France and I'm a little clueless

Thanks,
Jenn

 

[bavaria]

I believe that is near Champs Elysees - if so, RER from CDG-Etoile to Marne La Vallee. About 12 euros. 40 minutes