A $21 million adventure park in the hills west of Porirua is being hailed as a "game-changer" for the city's economy.
The network of trails on Rangituhi, or Colonial Knob, is expected to attract walkers and mountain bikers, and other attractions will include two cafes, a chairlift, and an indoor surf simulator.
"It's like a year-round ski resort that doesn't require snow," Porirua Mayor Mike Tana said.
Work would begin next year and take two years to complete. More than 100 jobs were expected to be created.
"Estimates show around 80,000 local users will visit per annum and a potential economic impact, over five years, of about $40m coming into the Wellington economy.
"The potential for people to invest in Porirua goes up tenfold. This is huge for the whole region."