There's very little in this life for free and this has got to be one of the best of them. A breathtaking walk taking in some of the city's most amazing beaches.
Bring your walking shoes though, it's a good 90 minute walk along the coast so stilettos are not advisable!
Oh, and for accommodation for when you're in Sydney, look no further than www.hostelworld.com. I use it all the time and love it.
Enjoy Sydney.