Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The Alaska River Guide:Canoeing, Kayaking, and Rafting in the Last Frontier

I have read many river guides and find this one to be little help in any whitewater decents. I would instead try to find the out-of-print book "Fast and Cold" for information that contains valuable whitewater information. The Alaska River Guide is a book for someone who needs general directions and an incredibly broad overview of the larger picture. Details and maps are incredibly vague to the point one wonders if the author actually ran the rivers described.