Hunua Falls Reserve is a park in Mangatawhiri, Franklin, rated 4.7 by visitors.
A reserve built around a waterfall and swimming hole calls for a bit more caution than an ordinary park, since water levels and current can change quickly after rain upstream even if it looks calm and dry where you are standing. Regulars know to check recent weather in the wider catchment area, not just locally, before swimming near a waterfall, since flash flooding is a real risk in these settings. Rocks near the water are often slippery, so sturdy footwear rather than jandals makes a real difference getting close to the falls safely. A reserve like this also tends to be at its most dramatic a day or two after solid rain, when the falls are running fuller than during a dry spell.
In Mangatawhiri, Franklin, Hunua Falls Reserve is a local option for a day outdoors.