Most Helpful Guy
Tough questions. Bars and clubs will be filled with all the wrong people (unless casual sex is what your aim is then go for those places).
From what I've seen the only way that happens is friends introduce you to guys or you meet them in courses/work or you through sheer luck bump into them on the street.
Most Helpful Girl
You can try going to bars, and or online I find that a lot of people meet online now a days :)