"There were days that it was just so nice to focus on my work here. It was relaxing and really took my mind off the cancer."
Grant has opted not to have chemotherapy but his Vitamin C treatment costs about $1000 and sadly, having suffered three strokes three years ago, he is unable to work fulltime.
The family will hold regular fundraising sausage sizzles at the new business.
Mum Sharon, who home-schooled Jayden and sons Kaelyn, 14, and Bailey, 10, said the family could not have completed the project without the help of family and friends including members of the home-school community.
"Everyone just chipped in, helping with the art and just spending time with us, helping in whatever way they can."
The course looks a little like a mini-golf course blended with a ghost train and takes about an hour to complete.
The UV journey takes you through a gloworm cave, down the rabbit hole with Alice in Wonderland and even a meeting with a mad scientist.
"My favourite level has to be the aliens and UFOs," he said.
Earlier this week, Jayden had yet to complete the large pyramid in the ancient Egypt level, but it was no issue for the young man who spent four years loading logs while working as a stevedore at Northport. He lived on savings alone while building the mini-golf, mini empire and said he was looking forward to being his own boss.
"I had seen glow-in-the-dark mini-golf in Auckland and just had a dream to make this a reality at home.
"It's great to open this. There is very little for young people to do in Whangarei and hopefully, this course will give them somewhere to go."