It is hard not to like Koh Rong (a tropical jungle island of dreams, now firmly supplanting Sihanoukville as the go to beach destination), but it is hard to see how the whole archipelago won't go the way of Thailand's main resorts.
Lowlights: Road travel, package type tourists and massive development at Angkor.
There is also a small 'health check' charge.
For those that don't know, Angkor is a collection of temples in North West Cambodia close to Siem Reap.
To get the best out of Angkor you'll really need to find some space away from the big crowds and tour groups.