Book excerpt: While a life of adventure has traditionally been reserved for the rich and the sponsored, to the dirtbag, it's a birthright for the masses. Partly a celebration of an underappreciated subculture of hiker trash, ski bums, and vagabonds, and partly a 'how to' guide for adventure on the cheap, The Dirtbag's Guide to Life is the first solid attempt to define an outdoor movement that has taken root in backpacker hostels, long trails, and climbing crags around the world.