Like PP said, definitely plan for Magic Kingdom. They do a very cute morning opening show about 15 minutes before the park opens. The other parks have nothing like it (though they have much smaller, less exciting "shows").
Rope drop at any park is worth it - you will get so much done in the first couple hours the park is open (make sure to do the big, popular rides in the morning, then can do the less popular or rides with lower waits in the afternoon).
Magic Kingdom: Peter Pan, Space Mountain, Character Meet and Greets, Indy Speedway, Seven Dwarfs Mine Train when it opens, Haunted Mansion, Big Thunder Mountain Railroad, Jungle Cruise, Winnie the Pooh, Splash Mountain if it's hot, are all good choices for the morning.
Epcot: Test Track and Soarin' are the big ones for the morning. Sum of All Thrills inside Innoventions is also a good one to hit in the morning.
DHS: Toy Story Mania first or Tower of Terror, Rock 'n' Roller Coaster
Animal Kingdom: Kilimanjaro Safaris or Expedition Everest
Obviously this could change depending on your travel party (ie small kids might not or can't ride Everest). Those are the ones we try to hit in each park at rope drop. Have FUN!
