I can tell you the things my daughter loved at that age. Of course, every kid is different, and something that enchants one kid can freak out another of the same age. But here's what worked for my kid:
DISNEYLAND PARK:
it's a small world (again and again and again)
King Arthur's Caroussel
ALL of Mickey's Toontown except Gadget's Go Coaster.
Tom Sawyer Island
Pinocchio's Daring Journey
Storybookland Canal Boats
Casey Jr. Circus Trains
Dumbo (HUGE hit)
Alice in Wonderland
Disneyland Railroad
The Enchanted Tiki Room
watching/listening to the Dapper Dans on Main Street, U.S.A.
The Many Adventures of Winnie the Pooh
Thought she'd like Peter Pan's Flight but she FREAKED OUT. Also, Pixie Hollow wasn't open when she was that little but I bet she'd have loved it.
CALIFORNIA ADVENTURE:
Disney Junior Live on Stage (it was called Playhouse Disney back then)
ALL of A Bug's Land except It's Tough to be A Bug (it freaked her out)
Mickey's Fun Wheel (in a STATIONARY car)
Any and all Meet & Greets
The stage show in Hollywoodland
The Boudin Bakery Tour (believe it or not)
It wasn't open when she was that age, but I'm sure she would have loved Ariel's Undersea Adventure and Monsters, Inc.
Hope this helps!