On Summer Nights you should go and enjoy a movie under the stars. This outdoor cinema is located in centennial park and movies run for most of summer.
its a very romantic place to take someone on a date or just go with a few friends as an alternative to a night out drinking.
Make sure you take something comfortable to sit on like a blanket and some pillows or even better a fold up chair if you have it.
Getting there via the city you can take any bus that goes down Oxford St or take the train to Bondi Junction and its a short walk from there.