The swim area at Alexander is kept very safe by the park personnel. It is a rare gator that finds his way inside (usually at night) and they are quickly removed to other areas. The same is true for the swim area and run at Blue Spring. In hundreds of dives there (many examining the weed line) I have seen only one small gator, and the park rangers had removed him by the next day. There are lots of turtles there (including a rather large Gator Snapper) but they are all shy. The bream however are trained in ninja tactics and have been known to nip the unsuspecting ear lobe from time to time. 
