Harris Bay Cave is a tourist attraction in Sumner, Christchurch. It has a Google rating of 4.1 from 17 reviews. Reviewers say the cave is hard to find, so it helps to use a map and look for the stairs near the spot.
Coastal caves are usually best visited at low tide, when the rocks and access paths are dry and easier to walk. Shoes with good grip matter, as rocks near the sea can be slippery. Many visitors combine a cave visit with a walk along the coast, and reviewers often mention the Godley Head walks nearby. A torch helps in the darker parts of a cave, so it is worth bringing one.
For a short coastal walk and a cave visit in Sumner, Harris Bay Cave is worth the trip, especially if you enjoy the Godley Head walks.