Cheryl Strayed's 2012 memoir Wild has been a smash hit. Since reading it, I've also watched the Reese Witherspoon movie of the same name, which is a faithful adaptation of the book, and has the added bonus of showing you the scenery that Strayed made her laborious way across and through (and sometimes around).
Wild is a book about hiking and camping, but also about self-discovery, grief and healing. There is a reason why so many self-help books recommend walking. Cheryl starts her hike along the Pacific Crest Trail (along the west coast of the US) as a raw newbie, with boots that don't fit and a ludicrously overloaded pack. By the time she reaches the Bridge of the Gods on the border between Oregon and Washington, she has toughened up mentally and physically, made friends on the trail, and begun to heal from the death of her mother and some bad life choices.
There are some very funny moments in this book, and also some really painful passages. Strayed succeeds wonderfully in keeping the balance between laughter, fear and sorrow. I'm not surprised this book has been such a massive success.