Some links that may help you:
http://www.gambling-law-us.com/State-Laws/Florida/
http://www.myfloridalegal.com/ago.ns...2563D2007AA34C
http://theppa.org/forums/topic/262
You may determine from these, as I did, that a charity poker tournament is illegal in Florida (especially if you are awarding a % of the prize pool as tournament prizes).
However, charity poker tournaments do often take place in Florida, including sometimes participation of local government officials and police officers. You should, at a minimum, contact the Naples police department and the county sherrif's office to find out how they would view such an event.