Buses to Koh Kong.
Leave early morning around 7 to 7:30 am for $10 from the bus station.
The bus ride takes 3.5 to 5 hour to Koh Kong and 15 minutes more to the Thai border. Crossing the border on both sides can take from 15 minutes to an hour, depending on how many people are waiting.
To Kep
Cars leave from in front of the downtown market all day for about $4 a person or $25 for the whole car. Ride is about 90 minutes. G'day Mate and others have a van service with pick-up at your hotel for about $8 per person.