I'd have to rate this place as one of the rare gems of New Zealand. It's a camping ground I have been going to since I was two. So 20 years on and off I still go back there. Why?
Well it's a peaceful place away from the hustle and bustle of the cities, plenty of fishing, kayaking, rafting, swings, swimming, back yard cricket, touch rugby, native wildlife (blue ducks) and co plus plenty of other amazing things to do. The best part though is it's free to camp at! There aren't many places around NZ that are free to camp at anymore. This no fee includes camper-vans etc.
Ruatiti Domain is approximately 20-25mins out of Raetihi in the Ruapehu National Park district (North Island).
The camp ground is situated between the Manganuioteao River and the Ruatiti Stream. It has toilet facilities and cubicles to hang up solar or portable showers. All drinking water taken from the river, stream or taps is suppose to be boiled. Most popular time is around Christmas and New Years.
Here's a good website for looking up fishing spots, weather reports and regulations in the Ruatiti Domain area.
Also, if you're into hunting there's the Ruatiti Station just up the road that takes guided hunts for red deer and boar etc. For more information check the website below.
Directions to Ruatiti from various locations via Google Maps
From Wanganui to Ruatiti
From Palmerston North
From New Plymouth
I'll leave you with some pictures of Ruatiti Campgrounds so you can see what it's like! :)