Full 2 hour massage is best. Also see Thai Massage box. Best place to People Watch at 2 am. You get all types, and if you enjoy relationship analyizing, you'll get plenty of practice. No bonus points for spotting the transsexuals.
Entrance is disco price, with drinks and food costing more than regular hours.
I've listed the bars in expanding radius from Banglampu, not by preference. There are hundreds out there I have not listed where you can still have a good time. These are the local keepsakes. I include VAT and service if applicable. Most bars serve food too, and many full menu meals.