Hi, I haven't tried it and I'm a much less experienced pig keeper than many on this forum, but I would think that woodland would be a great place to keep pigs - it's their natural habitat.
I can remember years ago, when I was at University, going to the College farms and seeing an "experiment" where a handful of commercial Landrace x Large White gilts were turned out in a woodland, with a boar. Within days, they had built nests and wallows and were completely at home, so it's all there, even in domestic pigs.