The exchange rate for US and the Euro is very good in Thailand. You can stay at a 5-star luxury hotel for about 1/3 of what you would pay at home.
Stay at one of the 5-star hotels along Sukhumvit Road. You will have access to the Sky Train, shopping, and the entertainment districts.
Quick Tips:
When arriving at the airport, avoid the taxi drivers at the arrival gate. Instead proceed to the escalator at the end of the terminal and go upstairs to departures. Walk out the door and jump in a metered taxi that is dropping someone off. Make sure the driver turns on the meter.
Best Way To Get Around:
The best way to travel around Bangkok is via the Sky Train that runs above Sukhumvit Road. Traffic is Bangkok is horrible and during rush hour, it can take you forever just to move a couple blocks.
Taking a motorcycle taxi is quicker, but very dangerous as you can see by the many scars the motor-taxi drivers display.