Guana River is going to be your closest.
I can attest that Guana does receive a fair amount of birds, but it receives its fair amount of pressure as well.
Just south of Palatka is Rodman Resevoir, looking good there so far this year. I had a Hunter Safety class there this weekend and took a look around. Saw some Teal!
You can try Lake Goerge as well a little further south. if you get over here (Lake Goerge) let me know. I'll give the lowdown at that time.
Mossy Oak Waterfowl - Pro Staff
Puddleset Decoy Anchors -Prostaff
FFWCC Hunter Safety Area Coordinator