Great Blue Heron - not a great shot, but remarkable to see one actually IN the Saint Johns River. I've only ever seen herons and egrets in the creek tributaries or nearby ponds - never in or at the river.
Great Blue Heron (Ardea herodias) https://commons.wikimedia.org/wiki/File:Great_Blue_Heron_(Ardea_herodias)_-_Unorganized_South_Nipissing_District_(02).jpg