I live in Florida and the "winter" here is a joke. It hit about 80 the other day and we went for a swim at the intercoastal. This is where the river meets the sea so you encounter anything from dolphins to manatees.
The tide was low and water never really got above the top of their shoulders and if it did it was momentarily. We rode/swam/walked/tread to this island and even got greeted by a lone dolphin. Weird seeing one in such shallow water and so close. Anyway...enjoy