Definately don't miss the bag piper at Spanish Bay. Check out Stix there too - awesome food! At Pebble, be prepared for spectacular views and some killer holes and have some fun.
GO FOR THE CADDY! The best thing I ever did, they are seriously worth the money. My favorite is Barney, and if you see him tell him Ryan and Genevieve say hi (we met him when we were there the first time, getting engaged and then again on our honeymoon so I think he'll remember us). He is a lot of fun. But even if you can't get him, it was definately worth having the caddy for the Pebble course. And don't forget your camera!