Hi Kitty,
Bangkok is fantastic. Where are you staying? If you are near a sky train station, you have kicked a goal as it is the best way to get around. I would definately recommend a walk through Lumphini Park in the early evening to watch all the locals go through some very elaborate excercise regimes. Also,a trip to Suan Lum night market is worth the effort, this is close to the Park so it is a good idea to combine the 2. It is alot more pleasant and less frantic the the week-end market,and it is not seedy like Pat-Pong market, but make sure you do a trip to the MBK centre before to get a better idea of prices.

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I love Thailand this much