and bondi junction is orsum now. but i dont understand what else you'd really need to do. the city pretty much has everything. im in new york right now, and sure it's huge, and there's shit to do everywhere, but it's all variations of the same thing. going to a Gap store on 43rd st is no different to going to a gap on 12th.
want chinese food, asian groceries and shops? chinatown.
want a hippy environment? newtown
want gay? paddington
want galleries? paddington-darlinghurst
want to get mugged? redfern
want drugs? kings cross
want heaps of awesome clubs? city/kings cross/paddington(ifgh3y)/many other places
pubs? everywhere
then we have zoos, museums, art galleries, gardens, etc. air fares are also cheap - why not hop on a plane to melbourne for the weekend? or the gold coast. hell, you could catch a train up to the mountains or the gong [dont go to newcastle. it's shit]
people who find sydney boring may only go out during the day. but then again, even during the day ive never had trouble finding what to do.