What's the consensus on the best Sydney nightlife locations between:

The Rocks
Darling Harbour
Kings Cross
Oxford St/Darlinghurst

Most Americans seem to mention Kings Cross. I guess this is a somewhat seedy red light district. However, when I'm in Sydney, the locals say don't waste your time if you're over 23.

To be honest, for nightlife I have never wandered past Darling Harbour and the Rocks because I always have a blast in those areas, and never felt the need to go elsewhere.

Oxford St is the gay area, but all the locals say it is a good time as all kinds of people go up there, and there are tons of bars.

So what do other crews suggest?