Harwood Reserve is listed as a nature reserve in Sandringham, Auckland. It has a 4.3 rating on Google, and its listing points to Auckland Council's website.
A good nature reserve protects habitat for plants and wildlife while letting people walk through it quietly. A suburban reserve is often a pocket of bush, grass or a stream corridor, so it suits a short walk, birdwatching or a breath of green space close to home. Regulars know that early mornings are best for birdsong, that paths can be muddy after rain, that tracks may be narrow or steep and that the council's website lists park details and any closures. Stay on the paths, keep dogs out if signs say so, never disturb nesting birds and take your rubbish home. Wear sturdy shoes, check where to park and consider a longer loop through nearby streets and other reserves, since Sandringham and Mount Albert have several small parks and volcanic hills close together. If something is broken or unsafe, you can report it to Auckland Council so it gets fixed.
For anyone in Sandringham and central Auckland, Harwood Reserve is a quiet local green space to walk.