First of all, USE EARLY ENTRY IF YOU CAN!! Early Entry is your absolute friend. You can ride Space Mountain, Buzz Lightyear, Pooh, and the other Fantasyland attractions without lines.
And this would be the time you want to ride Dumbo or Astro Orbiter. . . eek!
Philharmagic and Pooh should be the only attractions you really need to hit first. Space Mountain and Splash Mountain are (USUALLY) fast loaders with FastPass. Buzz and Jungle Cruise are iffy.
Otherwise, late at night is great for most attractions. And definitely use FastPasses if you know you're about to eat lunch, or go to a show that has a huge capacity strategically, i.e. Tiki Room, Country Bears, Carousel of Progress, Hall of Presidents, Timekeeper.
Fantasyland is shot after 10 AM. Pan will have 45 minutes by then. Jungle Cruise is impossible after 1 on most days. Toontown isn't bad at night, but mid-day it's a terror. Attractions like Pirates and Haunted Mansion can have huge lines at one time, less at another (usually pre-noon is good for both). And throughout the afternoon, Fastpass/show attractions would work the best.
Use the parades, also! The first showing of SpectroMagic will be packed, so head to some longer-line attractions then, or during Share a Dream Come True. Then, go to a virtually empty second showing of SpectroMagic (if it's not that crowded) - across from Country Bear Jamboree is the least crowded at the late showing, by the way.
Good luck!