I have done this walk once 10kms, it was one of the best walks we have every had in our lives. The scenery, coves, beaches were all phenomenal. The views were breathtaking. We are going back in February and hope to go while we are there.
One thing I did like about the walk, there were plenty of bathrooms along the route, you can take your bathers and go swimming, paddling whichever takes your fancy.
Last time we went to Sydney in 2009 November we did walk a bit of the route and we got mobbed by a bird, it was nesting but we will never forget it, I might add it didn't do any harm, we just had a good time and made the walk that we had more memorable.
My husband did say at the end of the walk "why did we walk to a bridge which opens for the boats?" I replied "did you not notice the views, the scenery, the beaches etc?" He got then why it was important to go. Walk it, experience it then you will know what I am saying. Happy walking people!