I don't think you'll be able to see everything in 4 days.
DS son and I went in August 2001 for a week. We had a 5 day park hopper plus, used EE, fastpass, and did an E night. We still were not able to see everything.
We went to AK on 2 afternoons. We were able to do
Tarzan
FOTLK
ITTBAB
Safari
Kali River Rapids
Bone Yard
That's it! (The heat played a major part in this)
MK, we spent lots of time here, still didn't see everything. We missed:
Timekeeper
Hall of Presidents
All of Towntoon
Swiss Family Tree House
Diamond Horseshoe Revue
The Lion King Show
Train that runs around the park(can't think of the name)
Riverboats
Main Street Vehicles
Exposition Hall
Frontierland Arcade
Epcot, we were here for 1 1\2 days. We missed:
Innoventions
Living Seas
Canada
United Kingdom (did get a change to try the fish n chips, just didn't tour the pavilion)
Morocco
Japan
Italy
Germany
MGM, we missed:
Animation Tour
Bear Show (son was 9 )
Backstage Pass
We did Blizzard Beach one morning;didn't get to do everything there, and Pleasure Island one night.
We didn't get to go to DisneyQuest or Typhoon Lagoon.
I have a huge list of restaurant I want try. We only made it to a few:
Pizza Planet
Ohanas(breakfast)
Bongos
Beaches N Cream
Pecos Bills
Casey's
UK Fish N Chips Stand
Mexico's counter service
Dole Whip stand (yuck)
We were able to see Fantasmic, Illuminations, Spectromagic, Fantasy in the Sky Fireworks, TON, and the 3:00 parade in MK.
Make a list of all your must dos. Be sure these are done first. If you have time, repeat your favorites and see a few that aren't on your list.
Have you checked
ticket prices at ticketmania, paramount, connections....? Some of these places have prices that are better than disney, or include a breakfast voucher.