Are you a WDW espert?
In that case you may want to concentrate on what's different from the US parks and most of the unique attractions are in the Studios.
Ratatuille is coming to Epcot, but probably not for a couple of years so you may want to ride that, the single rider line is often quicker than using a fast pass. Mickey and the Magician is a very nice show, you should see it. Crush and Coaster is a nice spinning coaster, but it has often long lines and it's not worth to spend too much time for it. Unfortunately going there at rope drop may not work anymore because now there are Extra magic hours at the Studios as well, so by the time you'll be allowed in, it will already have a long line. Everything else at the studios is identical to the US or not worth it (DO NOT DO ARMAGEDDON, it's a complete waste of time).
At the main park most attractions are similar to the US, but they have their own twists. I'd say the Phantom Manor, Big Thunder Mountains, Pirates are all must do. BTM has long lines all day, so use a FP for it. Space mountains is a much more intense roller coaster, more similar to rock and roller coaster than the space mountains in the US. It may be a good or bad thing, depending on your taste for adrenaline.
Star tour is exactly the same, Buzz and Peter Pan are slightly better than the Magic Kingdom (but the latter has no interactive queue, use a FP for it if you can). Indiana Jones is a short roller coaster with one inversion: it can be a nice step up for someone who ever only did family coaster like BTM to a more adult one like Space mountains.
The night show is nice, stay until park closure to watch it, it's worth it. The afternoon parade is not my favorite.
Take you time and smell the roses, the strength of the park in Paris is in the many little details and general ambiance. It's a lovely park just to walk around.
Food is not great, the snacking scene is terrible. My favorite quick service is the cowboy cookout BBQ, at frontierland. Do not eat hamburger or hot dogs, they're terrible.