Here are a few I took when we went to Myakka State Park this summer. I took my good Panasonic FZ50 camera on this trip since there was a place to store it in my wife's rack bag.
This one was swimming in the canel along side of the road. He was around 6 ft long.
These two were swimming under a bridge we crossed just after coming out of the parking area. The one on the left was huge, at least a 12 footer.