BM - I think what you're referring to is sometimes known as 'jingle mail' which is where owners of US property under water, ie. in negative equity, post the keys back to the bank and the bank has no recourse. As I understand, that applies to only some loan companies and in some states. But of course, that's not going to help you here as you state you don't have a mortgage on the property.
I'd personally look carefully into the costs, any personal liabilities and implications of using an LLC. It might be that setting up an LLC to take ownership of a property in the expectation that you can then walk away might not be legal. I'm not sure, but I didn't think you can set up a LTD company here in the UK to do this. Sounds like you need some advice on this, I'm a member on wealthprotectionreport and you could register for 1 month and ask the questions in the forums, they might be able to give you some pointers.
It's sad to hear this kind of story. I too am looking at US property. I've seen the ads for property in Detroit, Buffalo, Rochester etc saying 20-30% yields are possible. What worried me is what kind of tenants are going to be renting places that are only costing a few tens of thousands of dollars. Florida I looked at too, but running costs for a Florida villa can be very expensive (air con, pool maintenance, bug control etc).
Hope you find some way out this...