For bars etc, I'd head to the area around the station (Collingwood Street).
If youre after somewhere to eat and like asian food, Id recommend Little Saigon on Bigg Market. Steer clear of Bigg Market for drinks though – bloody awful god forsaken place.
Also steer clear of The Gate. Scumbag central.
If you like Italian, theres a brilliant little Italian called Panni's on High Bridge Street (I think). May be worth phoning up to book though as it gets busy.