You could try these: (from AllEarsNet.com)
Walt Disney World Guest Relations
P.O. Box 10000
Lake Buena Vista, FL 32830
This is the universal address! For example, if you want to write to the General Manager of All Star Music, or any other resort, address the envelope to the person and use the P.O. Box 10000 address.Walt Disney World Guest Communications
PO Box 10040
Lake Buena Vista, FL 32830-0040
Include as much information as you can (CM name, date & time of what was special, location, etc.) and they will get it to the right place.