God's Middle Finger isn't graphic but really well written.
I second the Horwitz nomination and add Richard Grant, author of "God's Middle Finger" and "Crazy River." Both of those demonstrate a spirit for and enjoyment of adventure that was the core energy in Bryson's "In A Sunburned Country" and "A Walk in the Woods".
You should read "God's Middle Finger".
http://www.amazon.com/Gods-Middle-Finger-Lawless-Sierra/dp/1416534407