Well, if you're willing to drive a bit there is a school in Stuart, FL, named "Internal Arts Institute".
Here is their link:http://www.geocities.com/taichifl/
Dmitri Mougdis is a good instructor. I had the priviledge of visiting his school a couple of years ago while I was down in Florida.
He teaches Yang style Tai Chi in the Yang Sau Chung lineage.
If you're not willing to travel, there are some schools in Melbourne. Just google "Tai Chi, Melbourne, FL" and you will get a list and can find one to your liking.