We were very fortunate to have Rinzin as our tour guide.  He met all of our expectations and then some.  He has a very extensive knowledge of the history, culture, and natural history of Bhutan.  If there was ever a question that we had that Rinzin was unable to answer on the spot (which was rarely), he would research the question and get back to us with the information.   Our trek was very physically demanding for us, and Rinzin was always there to watch over our safety and comfort.  He was flexible with our itinerary based on our needs.  Rinzin is very passionate about Bhutan.  It is of utmost imortance to him that his clients have a positive experince on their visit to Bhutan.  We were impressed with his knowledge, intellegence, and kindness.  I will always recommend Rinzin as a perfect tour guide and ambassador of Bhutan.