Most of the WMA's around here have larger parking lots so it's nothing to see half dozen or more cars there. Some of them the trails lead several dirctions and some are just one main trail that leads in. You go in and find your spot and set up. I've had people stomp all over my hunt. It's public land. I try to stay off other' people's hunts but sometimes you find your self doing the same thing that happened to you.
I try to go deep and anticipate where everyone else will likely be....and set up where they will chase the deer. Also, consider hunting the edges of the WMA. sometime all the activity in the wma can push the deer toward the less pressured areas.