www.mytopo.com

Pull up your hunting area, and find the funnels. Pinch points. Whatever you call them. Inside corners, saddles, and so on. Also from the overview you can see things you didn't see before.
As far as food sources go, I assume you don't live in farm country. Find persimon trees, the apple trees would be great.....they are eating something, I assure you. I would say not to hunt right on the food source, though. You can, but later in the year if that food source is still available, they won't feel safe there.
Early season is the best. IMO the first 3 or 4 days of season are your best shot at the big boy. They are in summer feeding patterns, incredibly predictable, and haven't been pressured since last season. If you use the wind right, don't let them know you are there, and set up on a trail or funnel leading to a food source......that's my idea of heaven.