Ok according to the Ned DeLoach Giude to Underwater Florida "Divers w/out cave cert are not allowed to carry lights.There are 2 good dives here, Manatee Springs and Catfish Sink. Both are 100 yard hike from the parking lot.Catfish Sink is 120 foot circular basin covered with duckweed, its 35' deep and silts up easily. Manatee springs is 40' deep, very silty. Diving and swimming are restricted to the basin and the first 200 feet of the spring run. You can camp there. Although the park and spring receive thir name from the famed sea cows, only a few nmow venture up the run to escape the cool river water in the winter. Hopefully they will return now that boat traffic is not allowed in the run".
Ok so basically that means to me, not much ow diving, and if you silt it out then you aren't going to have much vis. This site is popular with cave divers cuz both sites in the park contain caves. Its a state park so its a $5 to dive, additional fees for camping I assume. Since it is a state park they may have rules regarding contact with manatees, I know Blue Springs State Park does, so you may want to call and ask.
I hope this helps.