All I will say is.... rent a yak... dont bother trying to fish off the shore (you dont tend to catch much, a lot of puffers, usually overcrowded annoyingness). Winter is a better time to come. I would look into the merrit island area or try west palm out. I can tell you it will be hard for you to find good spots as many won't give their spots away, but you can ask around some people are nice about it. I would say take a yak out at the refuge and try the flats out there. Mosquito lagoon is a popular place for flats fishing, again I suggest a yak. As for what to do... I would go live with whatever the current food source is at the time. If you go out there though you need to be aware or your surroundings esp if you wade... there are gators, salt crocs and plenty of stingrays.