The University of Michigan has over 12,000 books on-line that make up their Making of America web site. The site has a very good complex search engine and a basic search is on the main page which with a little thought will enable You to find some marvelous books. I have selected only Florida material here but the MOA site deals with the whole US.
Some of my favorites
Camp Life in Florida by Charles Hallock (selected chapters on this site)
A winter in Florida by Ledyard Bill
A winter from home by Charles A. Clinton
Through some eventful years by Susan (Bradford) Eppes
Florida: its scenery, climate, and history by Sidney Lanier
Sample frequency search for Florida (occuring 25 times or more)
Books (with active links)
Journal articles (with active links)