I liked Way of the Peaceful Warrior as well. Carols Castaneda's books pre-date his, and IMHO are much better. Start with "Journey to Ixtlan."
But then I would also recommend "1984," "Animal Farm," "Brave New World," "Shadows of Power: the Council on Foreign Relations and the American Decline," and "A People's History of the United States."
If you are looking for a light read, I recommend the Hunger Games. Get the second and third books, because every single person I know who has read the first book has read all three.