Ride your bicycle through the temples!  This is the best way to see all of the nooks and crannies between the temples - places where the jungle has overtaken ancient walls and statues which others miss as they ride their bus or even their speedy tuk-tuk between the temples.  You can join a trip through the temples with an experienced mountain bike guide, like a custom trip with PEPY Tours www.pepytours.com, which will allow you to access the hidden dirt paths which only a local could find.  Alternatively, you could rent your own "basket bike" from nearly every guesthouse in Siem Reap, or contact PEPY or Hanuman Tours to rent a high quality mountain bike for the day.  With all of these options, you will be glad you choose two wheels, and the Cambodians you pass will be equally as pleased with your transportation choice as they laugh and smile as you pass!