Howdy cerdafied, all 7 of you, welcome to disboards FW forum!!
I checked out one of my favorite FW FAQ sites and found you can't. It's at this link, about half way down
http://home.hiwaay.net/~jlspence/faq_fw.htm.
It says:
"A convenient and less expensive alternative to the Fort Wilderness carts was Golf Carts of Central Florida, which would deliver a cart to your Wilderness Cabin or campsite and pick it up and the end of your stay. Unfortunately, Disney put a stop to this service in the middle of October 2001. If they are able to start back up, I'll be sure to update this section."
It's always a good idea to call them directly, that same link has a contact number at the bottom of the page.