Get Pete at all costs! The tour was outstanding and he did an amazing job. Make sure to be generous with the tip at the end because he earns every single Baht you give him and more.
I came knowing nothing about Thai history and culture and he gave me so much to think about during the day. You do not go and just see the sights, you learn the history behind the sites and why they are the way they are.
The price is incredibly reasonable when compared to other tour packages from other companies.