Check out this site, as it has a number of different guides.
http://www.marco-island-florida.com/fish/char.htm
Of those listed, I know that Jay Peeler is real good and a real upstanding guy, as is Terry Shaughnessy - he's good friends with Mark Nichols of DOA Baits, and as is Stacy Mullendore who I was introduced to by Jay Peeler.
Any of these guys/guides can help you as they are all good. Another good regional captain is Andrew Bostick - if he fishes that area still.
Good luck and send photos