One of my friends swears by the Fenwicks, Neptune II, Dusk to Dawn route, starting from around 8:pm, or 2:pm on Sundays. D to D only for well after midnight though. But by then, if you not hooked up, then perhaps you are being too cheap or need to spend more on personal grooming...
Great as Thai girls are, one warning might be to watch out for the girls that weren't born girls. Enough katoeys/ladyboys to be careful, if this isn't what your interest is in. First time in Fenwicks we saw a couple a minute of walking in. To each his own, leaves more ladies, that were born ladies, for the rest of us.