What he said, or checl with the planning/land use department for your county. I tell people all the time, it's an AWESOME resource. My hunting partner works there, so thats even better, but the are usually more than willing to help, and there kinda slow work wise in the winter.
And man, knock on doors. i was kinda timid at first, but I have only been denied once, and they were very pleasent about it, just that his son hunted it. His son was actually getting out of hunting, so he told me to check back next year. I asked last year for a goose field, and the old lady said, "I wish someone wanted to hunt that field, we want the geese gone!" Well, she found her guy...LOL! I was actually in waders returning from a hunt, but I usually like to go out, dressed normal....
The other thing I sugest is when you get spots to hunt, at the end of season, get a little thank you card and.or gift. We usually get an inexpensive local wine and some jerky or canned goose, and either talk with land owners or in the card let them know how we did.
Heck, the little timber hole we have didnt flood up till end of season last year, when we mentioned to the owner that we didnt hunt it much, he invited us to come and put in a pump or divert his run-off to fill it sooner!!!! Just ask and BE NICE.