Richard and Brian (former YOW) and Kwan (Brian's friend) did an overnight ride to Khao Sok national park area, about 150km north of Phuket.
Brian was riding his '06 Harley Night Train and i hired a kwaka 650 versys. The versys went really well
Thailand has excellent roads in many cases surfaces and marking better than here. The last 100km to khao sok were pretty much constant twisties (signed 50km/h-80km/h) thru jungle, contoured rice fields and plantations. Great riding and Brian has great local knowledge of roads and sights.
overnighted at tree houses beside river (and monkeys) - see photos
if any YOW's interested in riding southern thailand i can recommend the bike hire company i used. (not to mention the guide and translator :-)