The Whangarei District Council website has this to say about the area:
Mount Aubrey is a steep, bushclad ridge and scenic reserve rising above the settlement of McLeod Bay. It is part of the remains of an ancient chain of volcanoes in the area, which included Mount Manaia.
The 360 degree views from the ridge and peaks are breathtaking, taking in the whole of the Whangarei Harbour, the Marsden Bay port and the oil refinery. Pataua and the Pacific coastline can be seen to the east together with Mount Manaia and the Whangarei Heads to the south.
From the Tiller Park car park on the outskirts of Reotahi, the track passes through 2 large rocks and climbs the hill. The climb is quite steep with many flights of steps up to the top ridge.
At the top, the track continues along the ridge but a minor detour to the right up onto a rock dome and a trig point is well worthwhile, for those prepared to brave the short climb off the track. The views from the top are spectacular but caution is recommended as there are no handholds.
The track descends more gently through an extensive area of puriri and totara trees to a point where it joins the Reotahi Coastal Walkway. Turning left, the track leads to Little Munro Bay (300 metres) or by turning right, it leads back to the car park at Reotahi (1.1 km) to form a longer circular walk.
The cache is about five metres off the track, but no bush crashing is required.