Its very rare to see alligators, but it is dependent on what part you dive. the gators will swim away from you, but if you are near one you won't know it until you are face to face. The biggest danger is boats, I had one coming straight at me when I surfaced, had to drop right back down FAST. the vis is terrible so you are really on your own when you get down there, no chance of starying with a buddy really. If you go with a charter, they should know where the gravel beds are so you find something, otherwise its just dirt.