Hi Crash,
I have not fished from St. Augustine but you are close enough to the Indian River/Taimiami Trail and with a guide /boat you can get into some very good redfish.
I know there is a very large public Pier around Daytona. I cannot remember its exact location but it is on the intercoastal waterway and near the Indian River. There is a fly shop ....Orlando Outfitters that can help you with guides and flies. The absolute best trip I/we had was out of Titusville / the Indian River (very close and across from the space center.The fly shop in Titusville is my favorite. We had a wonderful guide from there and I will try to locate his biz card if you are interested. We are hoping to get there in the fall.
Gerri