Book excerpt: Frommer's knows that low-cost travel should be fun, rewarding, and authentic, so they take readers to places where the tour buses don't go and show them the real heart of every destination. This guide is filled with listings for low-cost, quality hotels, B&Bs of character, pensioners, and comfortable hostels, plus information on inexpensive--but great--dining establishments, and the best things to do for free. Maps.