Oh yes Scotters - I didn't think of the summer heat when I wrote about the tuktuks - our trip around town was fine, but the trip out to the temple area was hot ! and that was December so I guess August would be much more unpleasant.

As I'm writing this post, I'm watching a documentary about Cambodia (Killing Fields, Tuol Sleng and the reign of the Khmer Rouge as well as a bit about the beach area of Sihanoukville. If you have Discovery Travel & Living channel, you might be able to see it.
From 14th -18th April this channel is also showcasing Thailand so if you have this channel it might help with the holiday planning.

We are regular visitors to Thailand but recently decided to explore further afield, hence our visit to Cambodia at Christmas and Vietnam at Easter.
We'd like to visit Luang Prabang too - looks very interesting.