Cockle Bay at Darling Harbor which, as noted above, will be cranking during the Olympics. The Rocks, a short jaunt from Cockle Bay, containing some of Sydney's best pubs. King's Cross , the most colorful nightlife area, Sydney's version of London's Soho with cool pubs scattered among strip clubs and prostitutes which, incidentally, are legal in Sydney. Near King's Cross, It's a very colorful and fun place to hang out and contains bars that cater to all types and tastes. The dress code varies according to the type of establishment, although wearing black is always safe bet.
Pubs are more casual than the clubs, although clubs resist people wearing suits.
Cargo pants and regular club attire is best for entry. During the Olympics most places will be more tolerant than usual of wardrobe containing logos of a country, team or sponsor. Sydney is a late-night town for clubbers. When To Go Sydney is pleasant anytime. November thru January are the hottest months in terms of weather and activity, but with temperatures hardly reaching below 15C making the winters mild at worst, Sydney is a fine hostess anytime of the year.