The problem with walleye fisherman is that they are like that everywhere not just in that body of water.
I can attest to being that type of person. I don't give information regularly about an area unless I know the person. It's like hunting public property, see a guy ask him to tell him where his spot is then go in there and jump it. If you introduce yourself maybe offer up your boat or tackle and see if they can show you a few things. That is basically how I got started into this walleye thing, make yourself approachable maybe try to make a fishing buddy or 2 that fish the area.
Disclaimer: I would offer info for this area but never fished it.