Well, as you already know it's risky business. Only suggestion I would have is try to monitor the other people you see using the public areas and try to pick your spot according to where they are not. I hunted public land for several years. And still have a spot that I go sometimes, when the time is right, and I have found that alot of public land hunters, due to restrictions of ATVs and limited access roads, Don't venture more than a 1/2to 1mile from the parking area, Get creative and get way back in there where no one else goes. Public hunting is tough, but can be good if you put in the extrawork. Also, by getting so far away you really lower the risk of some jacka$$ stealing your camera. (or treestand, which happend to me twice)

Good Luck.