It’s a controlled hunt every year with relatively limited permits. Unfortunately that means there are very few, if any, members here that have actually hunted at Magee Marsh. Your best bet is probably going to be calling the District 2 office for the Division of Wildlife and asking to be put in touch with an employee or manager up there at Magee.
A lot of times you can see deer trails through marshes and wetlands on Google Earth or other quality aerial imagery applications. If you know your exact area boundaries, I would start there with some online scouting. Key in on obvious areas of high ground, or “islands.” Usually those are pretty apparent also. Good luck!