Tieke Waterfall is a natural waterfall near Waihāhā, in the Kaitieke area of Ruapehu, in the central North Island. Its listing name says access is by lake only, so visitors reach it from the water rather than from a road. It is a waterfall that people look up for and visit, rather than a built attraction, so the place itself is the reason to go.
Open Locally has the waterfall rated 4.4 from 14 reviews. Its name, its place and its access by lake are the main things to go on for now.