According to the sign it can take about 30 minutes to walk from the entry point (near the small statue) to the centre and out again. What you can do with a few thousand old bricks and gravel. See next photo for more detail.
According to the sign it can take about 30 minutes to walk from the entry point (here) to the centre and out again. That is without stepping across the gaps between bricks. What you can do with a few thousand old bricks and gravel!
All this is "red zone" after the earthquakes and has to be demolished. The roof of my "old" house (now owned by the government) can be seen between the third and fourth river-side houses.
When I was a kid this bit of land in the foreground was level and extended at least three times further out, but after the earthquakes you can see the angle that land near the river slumped. We used to catch a lot of herrings (yellow -eyed mullet) here when I was a kid, hence the local name of Herring Bay. Across the river is the Bexley Wetlands.
There are occasional sewerage spills into the Avon River while all the sewer and road repairs are carried out. This rock wall was level and well above high tide level prior to the eathquakes. All the houses that can been seen here (except for those on the distant Port Hills) are in the suburban "red zone" and are still to be demolished.