Here is a place holder location dossier for the group that has the DC-3 in Marathon...
Aerial Visuals - Location Dossier - Antique Airplane Restoration...I say "place holder" since I only have an approximate location and I don't know if they accept visitors. If anyone can provide details that would be great.
I have started an airframe dossier for their DC-3...
Aerial Visuals - Airframe Dossier - Douglas R4D-3, s/n 05078 USN, c/r N763A...I am working on the history of the airframe so hopefully more details to come.
As for DC-3s in Florida, you should always first go to the Locator...
Aerial Visuals - Locator...actually this tool is good for looking up any aircraft type in any political region (just one search combination of many that you can do). For a list of where to find DC-3s in Florida go here for my search results...
Aerial Visuals Locator Search - DC-3,C-47,C-53,R4D,C-49s in FloridaI hope this helps. Let me know if you have any questions.
Mike