Mr MacDonald said the site would suit a holiday park, backpacker accommodation and a link to the national cycleway to support the adventure park which has a bungy jump, swing and flying fox.
That was something he was telling prospective buyers.
That sort of work would require a publicly notified resource consent.
He expected its six staff to be kept on.
"They'll be re-employed if they want to come back in."
Mr MacDonald started Mokai Gravity Canyon in 2000, 10 years after setting up Taupo Bungy which has a 52 per cent shareholding in Mokai Gravity Canyon.
He was confident of finding a buyer in a closed tender and that a new operator could re-open it fairly quickly.
Despite walking away he said the site and Rangitikei was still a viable place to operate a tourism business.
"I think it will become quite a significant destination," Mr MacDonald said.
"We have some other priorities. There's a reason behind it and that will become clear in the next week or so.
"We felt it was better for us to focus on Taupo bungy. That's our number one site. There's other reasons. I'm just re-thinking my future."