I have to say that is a very good question!
I too am a young professional - 27 yr old single female and I have no idea where you could go - sad huh!
My suggestion would be the new Vodka Revolution or possibly the old one?
Or the Ha Ha bar nr the Peace Gardens.
Have fun wherever u go - I'm off to get hot and sweaty at Body Attack!
FYI, there is a random Forum night out 2mrw, meeting at 8.00 in the old Vodka Rev, now Bai Hoi, if u favncy joining us?