Instruct: Classify Amazon reviews into positive or negative sentiment
Query: this book helped me to be a chicago eyewitness

What do you need when you are in a big city for the first time and just for 4 days? You need a simple guide, one that you can take with you while you're exploring the area. Using the top 10 system you can find all the highlights in a few seconds. As I need some structure in my exploration too, I used this guide in combination with Frommer's Chicago day by day. It made my visit to Chicago to a success. There will certainly be a next time.