our 3 2y.o.s loved the monorails, the train in MK, festival of the lion king, cinderella's carrousel, and playhouse disney (we started watching the disney channel so my kids would know who stanley, bear, and jojo were). they also loved any playground and the beaches...basically, they really enjoyed the things they have had some experience with.
they liked the pooh ride, dumbo, aladdin, and peter pan, and the jungle cruise, but they seemed to enjoy them more AFTER the ride was over with....like they weren't quite sure what to think of it while they were experiencing it, but liked the idea of it afterwards.
my kids LOVED watching the fireworks over the castle from the poly beach...you can see them quite clearly, but can't hear them.
have fun!