We thought that Angkor Wat was terrific. Just be prepared for extremely hot and humid weather. (I realize that most of the trip is going to be accompanied by fairly hot weather.) I think that we were in Siem Reap for four days, and I know that we one day, we had to go back to the hotel to shower because the morning was so oppressive. Think showers two or three times a day. (At 5 PM Siem Reap was 97 today.) Light-weight Safari clothes come in useful. At least one can wear shorts in most places, since unlike many of the Taj excursions, I don't think that you go into many temples. Hard for me to think about 100 in Bangkok as the snow continues coming down outside here in DC--more than anticipated-- though negligible compared with west of here.
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Eugene