"There are children digging among the branches to find huhu grubs and over there something completely different [a tea party]."
Art-work was strung between the trees and paint of all colours was being applied to fabric, brown paper bags and large plastic sheets which floated in the breeze.
Walker said a lot of people had come together to make the weekend special.
"My mum set up this part and she has done a pretty good job."
Kahu was making sure people could try all of the activities which included a spot where you could lie on the ground and use a mirror to see the canopy.
Sadie Chase, 10, has a go on the bucket drums. Photo/Ben Fraser
"There is a treasure hunt of pests, there are cats and rabbits and possums. It's the invader trail of invasive species."
Smale said Kahu had definitely been a very enthusiastic supporter.
"It's been lovely so far, I really love working with kids.