At Ōpunake's beachfront playground the standout piece is a rubber mountain shaped to echo Mount Taranaki's snow-capped profile, with kids scrambling its slopes, talking tubes and a slide back down, right where the coast catches the wind off the Tasman. Inland at Eltham, Soldiers Park keeps it simple, swings and a slide in a small-town green just off State Highway 3, a useful split-stop between New Plymouth and Whanganui.
Hāwera itself holds two options a few minutes apart. King Edward Park runs a storybook theme, a bronze Wendy statue paired with a Lions Club pirate ship, a tree fort and an old naval cannon kids climb over, plus a shaded sandpit and water play. Queen Elizabeth Playground nearby is the quieter, low-key green space for a shorter stop. Four playgrounds, spread wide across Surf Highway 45 and SH3 rather than clustered in one town, so plan the coastal stop for a calmer morning and save the inland ones for when the wind picks up.