One reviewer Lorina Spring said she was "pleasantly surprised by this little gem".
"Lovely bush walks, awesome facilities and cheap to stay overnight," she said.
Other reviewers boast of how "welcoming" and "polite" Mr and Mrs Cunningham are.
Mrs Cunningham said the way they presented themselves to the campers was one of the most important parts of the visitors' experience.
"The main thing is just being friendly," she said.
"People love it because we have all the extra things people just don't expect, like soap, dishwashing stuff, and we're just wanting to make sure everything is clean and that people are having a good time.
"You don't get that at other camping grounds."
Mr Cunningham said that most of their visitors were European tourists who found out about the grounds online.
"It's because these days, everything is on the internet. People who come here, they don't find out about us through pamphlets and that, they hear about us on the internet or through word of mouth which is why Rankers NZ is good for us," she said.