Dinner Key in Miami might be a good start Las Olas Blvd in Ft Lauderdale always has dockage behind the apartments Moss marine in FtMyers. The City of FtLaud has dockage along the river but hard to get. Some marinas look the other way if you are cool about it and don''t make a big thing of staying aboard for extended periods of time. I am always geting ready for a cruise ya know
Don''t hang out your laundry or clutter up the dock with junk,bikes outboard parts ect, plywood is a no no.