I'm with Gastrick on this one, Florida may have SOME tin, but not nearly the quantity (or quality) of lots of other States. I am from Pennsylvania originally and my Sundays were spent driving into the rural areas and trying to peer behind barns and bushes. There were tons of cars just laying around back then.
Later on we moved to North Carolina, and I was in heaven because the cars sitting around down there were mostly rustfree (comparitively), and plentiful. Then we moved to California, and old cars were everywhere, but way above my budget. I guess if you got out into the desert or remote small towns you could find stuff, but in LA the finds were already found.
When we moved to Florida I thought it would be a haven for tin, and while there is some, the salt air has taken it's toll on lots of it. There may be barns and large plots of land in the northern part of the State, but here in my area (So. Florida) there are so many restrictions via code enforcement and other issues, that you just can't drive around and see much in the way of old cars. Is there some? Sure, but proportionate to other areas, hardly any......and the stuff you do find is either bad or the guy has been watching too much Barrett-Jackson.
You mention you have found cars in Sarasota and even Naples, in my backyard, and I have too. I know of one place where the guy buys up all the old tin he can find and sells it at swap meets. I have been to his place and he does have some old cars, but most of it is very far gone and not cheap. Going to his place is frustrating because trees are growing out of most of the rusted hulks and the parts he has removed are piled up so that you really have no idea what they are.
That is why guys like Bill and I drool when we see what our fellow Americans in places like Oregon, Montana, Nevada, New Mexico, etc can find in such greater abundance. My dream is to take a driving trip out west and hit some of these old tin goldmines, some day. It seems that for some reasons Americans moving west took all the good tin with them and they ended up just parked in States west of the Mississippi.
Don