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Many people fly to Phnom Penh for a tourist or non-immigrant visa at the Thai embassy there. If all you need is a "visa run" for an existing multiple entry visa, or else just another 30 day visa on arrival, then you can take a bus to Aranyaprathet, Thailand which is right next to Poi Pet, Cambodia.

The Poi Pet border town is one of the few paved roads where goods pass between the two countries.This has led to an immigration post there. Poi Pet is also a gambling place for Thais. Since gambling is illegal in Thailand, many Thais step over into Cambodia. Once you walk past the casinos, there isn't much in Cambodia for foreigners, and you won't see many Cambodians at all in the casinos, except service people. The cost for the bus ticket at Bangkok's Mochit Northeastern Bus Terminal to go to Aranyaprathet is only a few hundred baht each way, and it's only about 5 hours each way.

There are lots of motorcycle taxis and tuk-tuks at the Aranyaprathet bus station clamoring to take you for the 10 minute ride to the border. Alternatively, there are also tour agencies on Khao Sarn Rd. and on Sukhumvit that take minivans and big buses of people to Cambodia and handle everything for you, whereby you leave Bangkok in the morning and return that evening.These services can also be found at many places in Pattaya.

The main advantage of Poi Pet, Cambodia is that it's nearest Bangkok and Pattaya, cheapest and quickest to go to by land route to Poi Pet, but there is no Thai embassy/consulate at Poi Pet so it's really good only for people who already have multiple entry visas or need a new visa on arrival.

I would always do a border run to Poi Pet in Cambodia from Pattaya. I would use a visa service. The price was around 3500 Baht. They would pick you up at your place and drop you off. I would be in an air-conditioned mini bus with 6 or 7 other people. It would take about 4hrs to get there. We would then stop at a restaurant; our food was included in the price of the service. At the time, the visa service crew would handle the Cambodian Visa’s for us while we ate. (I don’t think they can do that now).

We would then head to then border crossing and get stamped out of Thailand, walk a few 100 meters up the road and get stamped in to Cambodia, walk across the street and get stamped out, walk back down the road and get stamped back in to Thailand, head back to the bus and go back to Pattaya.

The trip start to finish would take around 9hrs.