I've found this to be the best DL touring plan:
Get there well before opening; they'll let you on to Main Street and hold you at the edge of the hub until the official opening.
1. Ride Buzz Lightyear.
2. Grab a Space Mountain FP.
3. Cross the park to Splash Mountain, and work your way back-
Splash Mountain
Haunted Mansion
(check at this point to see if you can get an Indy FP- ride it before your FP, and use your FP later. This is definitely one to do more than once. Indy rocks.
)
Pirates
Indy
Jungle Cruise
3. Head to Thunder Mountain. If the line is too long, GO BACK IN THE EVENING OR AFTER DARK. The Thunder Mountain cue is miserably hot.
By this time the park will have gotten crowded and it'll be time to wing it. The only other can't-miss lines you'll have left will be Finding Nemo subs (another line that isn't as shaded as it could be- get in line after sundown) and Peter Pan.
I have yet to come up with a good plan for negotiating Fantasyland.