I've been to Bangkok heaps of times: on school camps, en route to other places, and for holidays. If you follow the Thai-Malay Peninsula, its the next city along from Singapore and Kuala Lumpur. It's an overwhelming place, its so gigantic and busy and loud and colourful. There are huge, modern buildings alongside museums housing the King's royal barges and ancient temples. The people are friendly and the food is amazing. One step down the wrong street, and you can become completely lost.
It's a shame how many (most?) Westerners only think of the sex trade and pretty boys when Bangkok is brought up.