Some books that come to mind:
On the Road – Kerouac
Walden; or Life in the Woods – Thoreau
A Boy’s Will / North of Boston – Frost
Adventures / Memoirs of Sherlock Holmes – A.C. Doyle
Anything by David Grayson Probably rather difficult to find. I stumbled upon a book by him at a library book sale last year, and then another at a used book store. But they were both old books, and I’m pretty sure he’s no longer in print. His books are sort of written for children, but he has a unique perspective that you won’t find anywhere else.
Journals of Lewis and Clark
The Stranger – Camus
Steppenwulf, Siddhartha – Hesse
Picture of Dorian Gray – Wilde
Anything by Loren Eiesley
Ishmael – Daniel Quinn