We had a wonderful Tuk Tuk driver. If you ever go to Siem Reap, stay at the Tranquility Angkor Villa and ask for Mr. Keo as your driver. They couldn't be more hospitable.
We spent sunrise at Angkor Wat, watching the day break over the world's largest religious monument, a huge Hindu temple. It's also a symbol of Cambodia, and Khmer architecture at it's finest. You can get more information on the details of Angkor Wat on wikipedia.