For sale: One naturists' park, with strings attached - you have to leave your clothes at the door.

One of New Zealand's only two nudist parks - the other is near Blenheim - is on the market.

And Kevin and Joan Sampson say any buyers of the Katikati Naturist Park, northwest of Tauranga, must keep it as a clothing-optional camp for 10 years.

The memorandum of encumbrance for the 10-year period was about the limit of what could be expected and the new buyers would probably have to be naturists themselves, Sampson said.

"It would take somebody who understands the naturist ethos to run it successfully. I don't think non-naturists would feel comfortable."

The Sampsons started the business from scratch in 1996 and had "put their heart and soul" into it, but now wanted to do other things while they still could.

The 5.7-hectare property is on the market with an asking price of $NZ1.9 million ($A1.48 million). It attracts 16,000 people a year and won a Tourism Industry Association award for holiday parks in 2008.

The clothing-optional park only has one clothing rule: no swimwear in the pool, spas or sauna.

Any new owners would have to be alert to people who just wanted to perve at naked bodies, Sampson said.

"You pick up the signals pretty quickly."

The Sampsons will remain in Katikati and Sampson said they would likely return to the park - as guests.

AAP