From Shoal Bay on Aotea Great Barrier Island, you can take Cape Barrier Road to the Whalers Lookout track. The road becomes narrow with gravel, and the last few hundred metres is recommended for 4WD only.
From the parking area, follow the short track to Johnsons Bay, then hike up onto Cape Barrier to the Lookout, about 15 minutes. The Cape used to have an observation post to look for whales coming through the Colville Channel. In the early 1960s, whale hunting ceased and now it is just a bit of island history.
In winter and spring, you may get to spot migrating whales. Seals appear around the bay from time to time.