Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Key to Heavenly Mountain Bike Rides

I just finished a mountain biking vacation in the Zion area. Between this book and Dean at "Bike Zion," I found some incredible singletrack: Green Valley and Church Rocks in the St. George area, and Gooseberry Mesa, the JEM trail, and Slickrock Swamp just outside of Zion. I rode them all and loved them. I ride in Moab frequently, and the trails on Gooseberry surpass anything in Moab, except maybe Jackson's Hole. The book is very helpful with directions and trail descriptions, but why are not more Zion area rides included? In July, I'm headed back to the area, this time to Brian Head, with book in hand! To the author: thanks for your research and sharing these world-class rides.