Instruct: Classify a review into positive or negative sentiment.
Query: Very Informative

I have found this guide to hiking in the Wind River Mountains to be very informative. The author goes beyond just descibing the difficulty or lengths of hikes. He describes the geology, landscape, vegetation, and even whether a lake holds fish and what type of fish it holds. At times, I felt as if I was on the hike myself. I have been very pleased with this purchase.