At the end of Price Road, you’ll see a stile across the fence into the reserve. Head across the reserve to a gate in the NE corner (the row of trees on your left intersects the reserve at that point). Join the gravel path there and continue north alongside the Puhinui Stream.
Crossing the footbridge, continue upstream, now on the Puhinui’s true left bank. Leave the stream at Aerovista Place. Turn right out of Aerovista into McLaughlins Rd, then left into Vogler Drive to the junction with Roscommon Rd. Turn right and follow Roscommon Rd until the traffic lights.
Turn left off Roscommon Rd into Wiri Station Rd. Follow this road about 2.5 kms to its junction with Lambie Drive and Druces Rd. Diagonally across the intersection, the Puhinui Stream track opens up again. Follow it through to meet up with Kerrs Rd.
Follow Kerrs Rd east up to Great South Road, turn right down Great South Road for 400ms to where the Puhinui Stream goes underneath. Take the pedestrian underpass to the true right-hand bank of the Puhinui Stream and follow this very impressive track (opened 2012) right up and underneath the Southern Motorway into the Auckland Botanic Gardens.