While cabs are often not the ideal method of transportation in Bangkok due extreme congestion on the roads (try the river boats or the sky train when possible), they are cheap, and sometimes the best option if you traveling beyond the bounds of water and sky. If you are staying in a big tourist hub, particularly Khao San, many cabbies might try to fix a rate before hand. It might seem like a great deal, especially if you have just arrived in Southeast Asia, but the fixed rate they demand will usually be at least double the metered fare. Ask them to run the meter or find another cabbie that will.
From what I could tell, this was my VIP cab ride to karaoke (noraebong!), gambling, booze, hookers, and sodomy. Unfortunately, I only utilized it to get home faster for much needed sick nap time. My loss, I guess.
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