Wanda, Diane, Barbara, and others...
I have been corresponding with the FL State Hospital about my great grandmother. You can write to them for records, etc., at:
Florida State Hospital
Attn: Health Information Manager
Deborah Germany, Sr Clerk
P. O. Box 1000
Chattahoochee, FL 32324-1000
You have to provide proof that you are a relative of the person, i.e. birth certificates, census records, pedigree chart, before they will release any information.
Also, some of the hospital records from 1900 - 1978 made it the Bureau of Archives. You can write to them at:
Bureau of Archives and Records Management
Department of State
Mail Station 9A
Tallahassee, FL 32399-0250
They will need as much information as you can send them in order to do a thorough search. Also, there is a charge of 25 cents a page for copying of any records they find and a $2 mailing fee.
As for burials, if it was depression era or earlier, you may not be able to locate the grave. According to the Hospital Funeral Director, when the depression hit, the cemetery was shared by the city and the Hospital and neither had the funds for upkeep of the cemeteries, so they let them go. As far as I can tell, the last survey of the (older) cemeteries was done in 1923 and you can find it at http://freepages.genealogy.rootsweb.com/~chattahoochee/
I don't know if there is an historical society working with the hospital to recover and preserve the older cemeteries. If not, there definitely should be, not only for our ancestors, but there are civil war veterans buried in there, too.
Hope this helps you find what you are looking for.