Night Creatures are what you need
I'm with you MorbidMariah. It's hard to find appropriate sounds that add the ambiance of spooky woods without a bunch of other more obnoxious sounds coming into play.
I would recommend getting your hands on the first track from Disney's 2nd edition of
Chilling, Thrilling Sounds of the Haunted House, entitled "Night Creatures." (This is not the orange album of the early sixties, but rather the remake that came in 1979 with the much more colorful jacket.)
This track (and others from the album) are showing up on Disney's Halloween albums for kids as bonus tracks. I think it is just what you need — crickets, wolves baying at the moon, owl screeches — very, very nicely done, in my opinion with no extra filler. I got my remastered version on the album "Halloween Songs and Sounds," which can
downloaded from iTunes.