Into the Wild (2007), based on a true story. Available on Netflix (US at least).
http://www.imdb.com/title/tt0758758/>After graduating from Emory University, top student and athlete Christopher McCandless abandons his possessions, gives his entire $24,000 savings account to charity and hitchhikes to Alaska to live in the wilderness. Along the way, Christopher encounters a series of characters that shape his life. 