Spent 3.5 weeks in Thailand, Cambodia and Vietnam earlier this year
Spent the following time in the following places.
3 Nights Bangkok
2 Nights Siem Reap
4 Nights Sihanoukville
2 Nights Koh Rong
3 Nights Phnom Penh
3 Nights Ho Chi Minh City
7 Nights Hoi An
Don't have time to go through everything we did but can whole heatedly recommend the Lazy Beach villas on Koh Rong Samloem. http://lazybeachcambodia.com/Home.html
Pretty expensive for Cambodian standards ($60 per night) but I thought they were worth it. Stunning beach which was pretty much exclusively for Lazy Beach guests, large beach front bungalows with big terraces and hammocks. Fantastic for just chilling out and getting away from everything!
EDIT - completely didnt realise i'd already replied to this thread above haha!
No problem mate. I resurrected it.