Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best "Walking Tour" ever!

If you can go to San Francisco and take Don Herron's Hammett walking tour...do it! I promise you will be entertained, informed and exhausted (remember, SF is a city of hills.) Don is really an expert on the life and literary merits of Dashiell Hammett, especially the works he produced while a resident of this beautiful city by the bay. Over the many years that Don has guided this tour, he has uncovered (and willingly shares) many fascinating facts and factoids about Hammett and 1920s San Francisco. If your travels never take you there, however, this book is a worthy substitute. Beautifully produced and well-written, Don's book is perfect for the armchair traveller and any hard-boiled mystery buff.