I think a lot about a YA book I read in the early 80s, probably a Scholastic book. I believe it was written from the POV of a teen girl and was about her and a male friend. I think she might have been a twin. The male was a quiet, reclusive guy. They were both unhappy at home, and made a plan to run away to the redwood forest, a state forest? in Northern California. They guy planned most of it. They left and lived in the woods, sometimes going into a small town. I think eventually the girl leaves and the guy stays in the woods. Thanks for any suggestions.
Lost Classics of Teen Lit: Name That Book! 