Further to what Madison suggests...
If you haven't already, take a peek at our
Share Your Work critique forum (password =
vista) which is split into genre sub-forums.
Me personally, I'd maybe consider posting action/adventure material in Mystery/Thriller/Suspense sub-forum, since it gets more traffic than Other. Not a perfect fit genre-wise, perhaps, but sometimes you have to seek the best compromise.

I reckon action/adventure might have elements of thriller, mystery, and a smattering of suspense too.
We also have a
Mystery/Thriller/Suspense discussion forum, if you want to ask any questions of writers who write in these genres just to see what they think.
-Derek