Hmm, I didn't like this one much when I read it (years ago), but your review is so good I feel I should give it another chance!

The way it's so scarily easy for Trisha to get lost has very much lingered with me. I read a real-life story recently about a hiker who died in the same way (left the trail to go to the bathroom, couldn't find the trail again) and it's really reaffirmed my determination not to go off into the wilderness without lots of cell phones, maps, and compasses. :D