I don't hunt Ft. Gibson, I just have scouted there a couple times. When looking for a place to put a blind, I would check the 14-mile creek arm first, long bay second, then mallard bay, maybe flat rock creek. As far as waterfowling goes I am pretty sure that those are the areas that are best for hunting. If I had to pick one of them I would choose the 14-mile creek arm; the last time I checked there was great habitat just not enough water. Right now there should be enough water though.
I would strongly recommend looking on the wildlife department atlas online and/or google earth before going anywhere.