These days my three year old is really into Mickey Mouse Clubhouse, and when I found out we could send a letter to Mickey and friends to receive an autograph in return, I knew it would make her day!
About two weeks ago my daughter and I sent the below card on a rainy day.
Walt Disney World Communications
P.O. Box 10040
Lake Buena Vista, FL 32830-0040
Walt Disney Company
Attn: Fan Mail Department
500 South Buena Vista Street
Burbank, CA 91521
The turnaround time was rather quick, but be sure to give it at least a month before hearing back.