How about that book about the woman who walked the Pacific Crest Trail? Looks like it's called "Wild." I've always been an avid hiker and backpacker and I know the movie was pretty popular. That might be the movie idea, by the way.
Cheryl Strayd. It's a great book about starting over and the PCT. The film was entertaining, too, although if you're an avid backpacker you'll doubtless spot errors, exaggerations, and stereotypes.
I'm into mountaineering--done my fair share of hikes and backpacks.
