Ticks are a major problem on NW Florida hiking trails also ... so bad that I rarely do any outdoor hiking any more in the summer. No matter how much repellent I've used, it seems ticks and/or chiggers find a way to attach themselves in tall grass or woodland environments.
I was talking to a doctor I met on the AT this spring, who was telling me that the bacteria that causes Lymes disease is very similar to the bacteria that causes syphilis. nice huh?
some reading here on the subject:
http://www.ncbi.nlm.nih.gov/books/NBK2314/