And beware of the Taxi Meter scam as well. I was in transit at Bangkok just last week and caught a taxi to a well known down town hotel where I've stayed many times before. The trip usually costs me 250 baht using Metered taxis, but on this particular occasion, the taxi meter started going up quicker than what I perceived as normal and the journey ended up costing me double at 500 baht. I made this trip twice that day (went there again to pick up a friend later that evening) and the latter trip cost me the expected 250 baht. It confirms that the first driver had a scam meter in his taxi. He tells me he only does taxi fares to and from airports, probably so that foreign passengers taking his taxi wouldn't be as aware as a local person about the correct fares.