The great thing about Disneyland Paris, is that you can hold as many fastpasses as you like on multiple rides! Take advantage of that.
Make sure you ride:
Big Thunder Mountain, Space Mountain, Phantom Manor, Indiana, Rock n roller coaster, Armegeddon, Stunt Show, Star Tours, Hunny I Shrunk the Audience. I've probably missed a few but they are the best!
If you go to the Village eat in: Annettes Diner (fab!),Cafe Mickeys (lots of characters), Rainforest Cafe (amazing animatronics and effects).
Where abouts are you staying?