your best bet is to get in as early as possible. if it means being in there 2 hours before sunlight thats the dedication that will pay off. see if there is a quiter route in there than just the thickest spot. deer will take the path of least resistance just like a human. there might be a trail somewhere or a tunnel you might have to crawl through but might be harder ground or packed down mud or something that will make it a bit quieter than another trail. also try to "sound like a deer" when your walking in. take a few steps then stop for 2 min. keep your grunt call on you make a couple very soft grunts when you stop or something. obviously you know and plan on coming to that spot while the deer are in it because its their bedding area and you mainly hunt with a bow so your plan is more or less a spot and stalk method. see if you can get as close as you can without spooking them and try to call them to you. might take 5 times or so to get progress but all you need is that one time. one last thing that could work but is really a last resort is wait for a windy day. come into that thick swamp with a good head wind. the wind will conceal alot of noise and scent if its blowing the right way for you. only thing with the bow and the wind is you gotta be real close but it is possible. i believe outdoor life magazine had an article recently about hunting in the wind. anyway good luck!