Hi there, Carmen!
Because Memorial Day will fall during your vacation (May 28, 2012), I'd advise you to avoid the Magic Kingdom and Epcot on that Monday. That said, here's my suggested itinerary for you,not counting your arrival and departure days:
Friday, May 25 - Arrival
Saturday, May 26 -
Disney's Animal Kingdom (Quick Service meal: Dino Diner)
Sunday, May 27 -
Magic Kingdom (Quick Service meal: Tortuga Tavern or Cosmic Ray's)
Monday, May 28 -
Disney's Hollywood Studios (Quick Service meal: ABC Commissary)
Tuesday, May 29 -
Epcot (Quick Service meal: Sunshine Seasons food court)
Wednesday, May 30 - Departure
If you want to experience
Star Wars Weekends at the Studios, switch your Studios day with Animal Kingdom.
This plan will, I think, help you maximize your time in the Parks while trying to avoid the bulk of the Memorial Day weekend travelers.
Have a great time!
See you later, celebrator,
-Deborah B.