There's a guy on here, I'm not sure what his screen name is that made a DVD about hunting swamp, public land swamps just as well. I've heard from numerous people that the DVD helped them kill some big swamp bucks. Hopefully he'll chime in here, Dan is his name.
The best thing to do is find the thickest area with a little bit of highland in it and set up there. I've never hunted swamps but have a pair of waders just in case I need them to hunt. You'd be surprised how many people won't cross a creek to hunt and those are the spots the deer know they are safe.