Bangkok - the big, hot, dirty hub of southeast Asia.
Bangkok will be on most travellers' itineraries because it is the gateway to many parts of southeast Asia. It's a monstrous city that moves at a frantic pace with new developments sprouting up everywhere. It's increasingly modernising and is surprisingly safe, minus the hustlers and scammers that you need to do your research about. Many travelers will flock to the Khao San Road area for it's budget prices but staying in Sukhumvit or Lumpini is a much more convenient location to get around.
Insider Tip:Many taxis and tuk tuks will insist on taking you to a tailor store or two between A and B. Capitalise on this by insisting that the fare is as cheap as possible or even free and plan to spend around ten minutes in each store. One stop can get a discount on fare and two can make it free - they get rewarded with gas coupons for taking you there. Also, don't buy tickets from the TAT - they overcharge tourists and make a hefty profit from your naïvety.