The difference between a tourist and a traveler, says Theroux, is that the tourist knows where he's going. Theroux (The Great Railway Bazaar), a traveler, as half a dozen of his popular books have attested, had no design for this adventure, no advance ticketing nor any commitment to stay or go anywhere. His only aim was to explore the Mediterranean coast without resort to airplanes. As a result, he found himself in unfamiliar villages on untraveled roads, acquired unexpected companions and slept in an assortment of inns, from fleabags to Hilton hotels, in Gibraltar Spain, the Riviera, Croatia, Sardinia, Greece, Albania, Morocco, the Levant and Israel. His pictures, like those of a wanderer with a sharp eye and an informed intelligence, though a large measure of condescension as well, are fresh even when he lands in well-reported places. Although most of his informants are casually met, now and then he interviews the famous, among them Paul Bowles in Morocco, Naguib Mahfouz in Egypt. This is a Mediterranean coast few know, as exotic and tumultuous now as throughout history.