Also-- because you are going to be there on a busy day.....do what we did:
When we entered the park, we immediately got a fast pass to Buzz Lightyear. When you receive your pass, at the bottom of the ticket, it tells you at what time when you can get your next FastPass ticket. Get your next FastPass (at whatever attraction you're interested in) immediately at that time posted, and so on throughout the day. You'll notice that as the day goes on, the time between getting each fast pass gets longer and longer.
Also, each FastPass tells you a 1-hour window that you should return to that attraction to ride the ride. Disregard those times listed. You can use your FastPass at any time of the day AFTER the time listed on your ticket. You do NOT have to go back to that attraction only during the hour listed on the FP.
The FastPass is a great gimmick, and it's so great to bypass those long "standby" lines.
Also, keep in mind that some rides have a "Single Rider" line. Two I know of are Soarin' over California in DCA, and Splash Mountain in DL. I'm sure there are many more lines that board members here know about. These single-rider lines basically bring you to the front of the queue, but then you have to wait for a single seat to open up (the ride attendants let you know). It's a good way to see a ride quickly if you don't want to wait 60-90 minutes in the standby line and don't mind splitting up your group.