I don't think I've heard of shuttles going to any of the malls, outlet or otherwise. I think if you don't have a car then taking a taxi or public transportation is your only option. You could consider renting a car for just one day and checking out some of the other things off site...a couple of outlet malls with Disney stores, Old Town, etc. I know a couple of the DTD hotels have rental car places in them, but I'm not positive of which hotels.