Its called tunnel beach, not because of that rock formation you can see, but the fact that there is a man made tunnel carved into the rock taking you to a secluded beach, its pretty cool
"In the 1870s Dunedin entrepreneur and politician, John Cargill, gave instructions for a tunnel to be carved through a sandstone cliff so that his family could have access to a beach near his home. It is rumoured he gave it to his daughter's as a birthday present. The tunnel provided them with private access to the beach and prevented 'exposure' at the public St Clair Beach nearby."
This is definitely a place to visit for a few more shots, probably at sunrise as its to the east....