Marilynne
Since you're down south, track down some duck hunters and see if they'll hook you up for a day shooting ducks, marsh hawks, and skimmers.  I wish I was doing photography when I lived in Texas, there were so many opportunities to get unbelievable shots.  I don't know if the birds feel an area is safe with duck decoys out, but I've have skimmers come by within feet of a decoy spread.  It would be worth your time to track down a duck hunter.  They carry a DU sticker on their vehicles and are easy to identify.  I don't know if your area has them but black bellied whistling ducks would make awesome pics in late august when their young are just starting to fly.