Just so you are not disapointed, Splash is still down at DL, but MK's is better anyway like everybody says.
Go on Pinocchio, I didn't see it mentioned above and MK does not have it. Also go on those unique to Disneyland but already mentioned.
I prefer HM at DL, but it's close to the same, but check it out.
At DCA Muppets, Millionaire, and Tough To Be A Bug are the same. I'm not saying skip them, but they aren't any different if you need to prioritize time.
Explore Downtown Disney, since it's so convienetly located in between the two parks.
But mostly enjoy the ambiance of Disneyland, the park that started it all. Take a peek above the fire station, that's where Walt's apartment is located. Check out the Disney Gallery (it's above PIrates), they just opened a new exibit I haven't seen yet called 100 Mickey's, to correspond to Walt's 100th birthday.
Fanstasmic is still on hiatus so you'll miss that.
Go on the railroad, there is a diorama of both the Grand Canyon, and dinasours that Walt had in the world fair in 1964. It's after the Tomorrowland station and before the Main Street station. Also don't miss Great MOments with Mr. Lincoln aslo from the 1964 world's fair.
Go to Toown Town, they have Roger Rabbit, a faboulous dark ride. They also have the jolly trolly, the rest of Toontown is pretty similar, different but the same idea.
Ride the monorail, it runs inside the park, the station is in Tomorrowland, it wil take you to Downtown Disney. A very nice way to exit when you are done for the day. It will also take you through Hollywood, Sunshine Plaza, and Condor Flats of Disney's California adventure, then it will go through the Grand Californian.
If you have time, take a drive, or a peak down Harbor Blvd, and passed Katella, that's the proposed site for a third park.
Most of all have fun, and say hi to all my friends. I haven't been since January.