Bus Travel
An option to flying is to take the bus. Fares seem cheap enough, booking from any travel agent in Bangkok it is easy to get a bus ticket one way for 900THB, this can be up graded at the Cambodian border in order to complete the journey by taxi. The bus leaves Bangkok at 7.30 AM and if you are lucky the driver might know Bangkok well enough to find the highway, we weren't! Thinking he was looking for a hotel for a further pick up, I stayed silent as he drove round in circles for over an hour before finally stumbling across a highway exit. He stopped twice en route to refuel. These minibuses run on liquid gas and for some reason it took a full 15 minutes to top up the tank each time.
When you reach the border they play a cute little scam. They stop at a shop where you are told you have to fill out the visa forms. They then try to get you to pay 1300THB for your visa. Do not be taken in by this. Politely refuse saying that you will pay at the border. Doing so will save you about 700THB.