From the lookout point you could see the waves pounding into Monkey Bay, so I walked down the track to have a closer look at the cave that runs through to the other side and opens out towards Whites Bay (I didn't go through the cave - the waves were coming all the way through to the entrance on this side).
The sound coming through the cave was deep and thunderous, so I tried to record it with a video on my phone.
I could see that the waves coming in to Monkey Bay had come right up and then down into the cave, but they seemed to stay at a safe distance after getting to the bottom of the track. Until I started recording some video.
Turns out the mic on my phone didn't pick up any of the bass sounds coming out of the cave anyway.