Hi Kate,
We are in PP at the moment having ridden down from Siem Reap. Roads have been fine but beware of the overtaking etiquette, if you are on a bike you are supposed to leave the road if anyone coming toward you fancies using your lane!
Otres Beach near Sihanoukville is worth a look, I'm sure a lot more of the southern coast is nice too. Take Google Maps with a pinch of salt, we ended up in the Aoral Wildlife Sanctuary on a sand road to nowhere on Googles "recommended" route. I'd try and get a second opinion on any roads leading into the Cardamom mountains or you might get more than you bargained for.
Have fun!
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