Lion Rock is listed as a waterfall at Piha, on Auckland's west coast. It has a 4.7 rating on Google. Lion Rock is best known as the large rock at the southern end of Piha Beach, so the waterfall tag may be a mistake, although Piha does have waterfalls nearby in the Waitākere Ranges.
A good waterfall is worth the walk, with a clear track, a viewing spot and plenty to enjoy once you arrive. They look best after rain, when the flow is strong, but tracks can then be muddy and slippery, so wear shoes with good grip and check track conditions first. Regulars know that mornings are quietest, that kauri dieback rules mean cleaning your shoes at hygiene stations and staying on the track, and that mobile coverage in the ranges can be patchy. Bring water, a rain jacket and sun protection, and never climb on wet rocks near the edge or swim below a fall in high water. Take all rubbish home.
For anyone visiting Piha, Lion Rock is a striking landmark, so check what is open and safe before you go.