Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The must read book before going to Yellowstone!

Whether you plan to drive, hike, swim, fish, camp, take children, take dogs, take pictures, etc; you really should read this book before proceeding with your trip to Yellowstone State Park. A healthy dose of caution never hurt anyone. Excellent narrative, sobering facts, and a quick read. Highly recommended!