Depending on the actual age, the Honey I Shrunk the kids Playground is kind of overwhelming. It's tough on parents, too! I lost my DD3 twice there in about 20 minutes.
Assuming you are talking 2-3 year old, here's a couple of things our 3.5 yo liked a lot:
- The railroad ride around MK.
- The Jungle Cruise
- Play areas in MK - Pooh's playful spot, Ariel's Grotto, and in toontown there is Donald's Boat and another play area that I am not sure if it has a name. Bring a towel and change of clothes if you are going to let him/her play in the water.
- The big musical fountain between the innovations buildings at EPCOT.
- Any Boat Ride (DTD, whatever)
- The animal exhibits in AK.
- Character Meals (Crystal Palace, 1900 Park Fare, depends on what shows / characters your child is into.)
- The pool / Water slide at POFQ. (Only helps if that's your hotel.)
- Turtle Talk with crush (EPCOT)
- Spectromagic Parade
- A ride on the monorail
- Storytime with Belle (at MK)
- Woody's cowboy camp (show at MK in FrontierLand)
Things to avoid with Toddlers - Dark Rides (IE any indoor rides, except Small World). I thought she would like Winnie the Pooh, but when we watch the video she still says "It's scary!"
SkierPete