Te Awarua o Porirua
Te Awarua O Porirua / Porirua Harbour is an overlooked but picturesque body of water between Porirua and Plimmerton. There is a shared cycle and walking track around much of the harbour, but you can also have a look from a carpark to the south of the Mana bridge, which crosses over a narrow section joining the two arms of the harbour.
From the carpark, look south to Ivey Bay (along the line of the bridge). If it is calm enough, take a moment to admire one of the best city water reflections in NZ before you set off. Then head around the edge of Pāuatahanui, the western arm of the harbour for as far as you want to go, or walk under the road and rail bridge to the eastern arm to the marina, then follow Ara Harakeke, the coastal shared track to Goat Point and Plimmerton, opposite the harbour entrance.
You can also drive south, then around the west arm of the harbour on Titahi Bay Road. From the end of the road, there is another track that takes you around the southern side of the harbour entrance.