The hotel bar itself is dark and the're lots and lots of people.
Most of the bars in Bangkok close at 2 o'clock except this is a hotel with a bar for customers of the hotel, but you can enter it. Usally it's open untill around 5 o'clock in the morning. The drinks are good especially the Singha beer. And when you're tired of drinking you can crash in one of the hotelrooms above you with or without someone you picked up in the hotel bar.