Of course the main attraction at Preah Khan is the temples and sanctuary's.  There is amazing detail and numerous rooms to explore. They are beautiful and so much to see. But looking at the complex from the "outside" so to speak, gives a different perspective and great experience of this amazing temple.

There is a well worn dirt path that encircles the complex from the outside of the surrounding wall. It is very peaceful and you are unlikely to see many people if any. Most people go right into the complex and don't give this dirt path a second thought. There loss.  During the short hike around the temple, there are several breaks in the wall to explore parts of Preah Khan that are not easily accessible from the center where most people/tourist explore.  While you are hiking, especially early in the morning, the sounds can be deafening with crickets and cicada.  

It is best to go in the early morning. Explore the interior of Preah Khan first and as people begin to arrive, explore this outer trail.  The sounds of nature along with the solitude make it a very special time.