maybe I'm just a freak because I wasn't all that keen on Sydney. Don't get me wrong the harbor bridge and the opera house is worth the entrance fee, but the rest is just hustle and bustle. Massive queues over the bridge every morning and evening it was all to hectic for me. Sorry!
If you fancy a really relaxing off season break then go to portugal. The weather is good in line with spain, but the people are very chilled and its great just to take it easy. WARNING ignore the time share people they are a pain in thebum. Generally though I have been there twice and I reakon i will be back again.
I went to Headingly for a chilled out weekend it was immense and I can't wait to get back. A good student atmosphere with many great pubs. There was also a cracking Indian restaurant with a bring your own wine which reduced the price.