Hi Jeanette,
I'm actually currently planning my wedding at the PPR. As long as you choose a wedding package, the different locations (including the terrace, ballrooms, gardens) are all available to you at no extra cost so long as they are available for your special day. The only location that will cost you extra is if you decide to rent out an entire restaurant, such as the Gabi Bar.... and that is $$$$$... I hope that helps.
Melissa