If you are looking for somewhere a bit different and awesome to go for a swim then the old Warkworth cement works should be at the top of your to do list! These old ruins are what’s left of Mahurangi Cement Works which closed in 1929 – So they have been around for a while! Unfortunately the perimeter of the ruins have been fenced off, as it’s too dangerous to enter due to possible falling rocks and the building crumbling, but it's awesome to walk around the fence line and check out what's left!
The cement works are just over an hour out of Auckland (refer to map below). The start of the dirt track leading to the cement works is sign posted just off Pulham Road, so it shouldn't be too difficult for you to find.
I would suggest leaving early if you want to avoid any traffic and to get a good shaded spot around the waterhole.
The water gets very deep very quick, so if you aren’t a competent swimmer or are taking young children then I would suggest taking some sort of flotation device or life jackets for the young ones. You can jump straight from the grass and into the water without worrying about hitting the ground, but I suggest checking the water first just to ensure that there are no hidden logs or concrete blocks under the surface; leaving in an ambulance would not be the ideal way to end a day of swimming.
There isn't a current so you can easily lie on your lilo in the middle of the waterhole and not worry about floating off the some distant land
There are plenty of places to jump off and dive into the water; there's a bank on the other side of the waterhole that you can climb up and jump off, and there are a few overhanging trees with swing ropes.
I only spent about 3 hours here but it's a great place to just chill with mates and go for a swim, and since it's fresh water you don't get irritated eyes or dry skin like you would normally get at the beach. I would even go on my own if it wasn't an hours drive from where I live.
So grab your friends, take a picnic and enjoy and great day out at Warkworth!