Hi guys I did this trip with just you in 2006, it was fantastic, brilliant local guides, the boat trip up the mekong was out of this world certainly the highlight, well apart from being on the back 0f a motor scooter in Saigon at 4:00am in the morning returning from a night well spent with the locals at some reaaly cool bars
when you get to cambodia, if you have time ( make time !!!!!) sweet talk your guide into taking you to the Killing Fields,
the temples at Ankor are pretty samey we all felt the same and were templed out after awhile
enjoy
steve