Hi Carlo,
The places you mentioned vary widely in safeness. Orlando, for instance covers a wide area with varying neighborhoods. You could be in a decent area on one side of a street, or a rough area a block away.
"Gated communities" are usually a safe bet, and have restricted access, but you pay HOA fees and have restrictions, maybe even on renting the property. A realtor (Estate Agent) that's local to the areas you mentioned would be able to guide you better as to where exact listings are placed, and where they'd be on a scale of safe areas. One thing I'd say is be careful, if you buy a place that's not safe, not only will people not want to rent it, but you'll be getting bad value for money.
Ktee mentioned your visa, you'll need one of those if you intended to reside here in Florida permanently. If you were looking to retire and spend a few months here at a time, then a B2 visa might be a possibility for you, and would give you up to 180 days per visit, I know a couple of people that do that. In all honesty, nobody (in their right mind) that had a choice, would want to stay here during in the Summer months, anyway.
Try
http://www.mls.com/?gclid=CNCV-JGJ1KkCFY9V7AodXlpqMw that will allow you to search for properties state by state.
purps
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