From Hideaway Biv in the Ahuriri

Head NE from hideaway biv towards the obvious erosion channel caused by water
and walk up either side of it to gain a flat ridge. Continue following the
flat ridge NE until you hit a scree climb upwards. Eventually the screen
changes from gravel to foot sized rocks. Head towards the rocky outcrop for
the summit. Note: Stony Peak is not actually as high as the point a few
hundred meters to the north over easy ground, but it is actually the correct
name and place. Consult a topo map for clarification.