What can 3 year olds do in Disney?

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Planning a trip for May of 2007--There will be 9 people over 14 years old, and Tyler, who will be just about 2 weeks shy of 3 years old. Any suggestions for what we should try to do?

My granddaughter was just three when we went down last year and had a ball, every time she sees Mickey or the castle on TV she says she wants to go see Mickey