The former engineer, Auckland University of Technology lecturer, probation officer and pastor, said he was on his way to get bread from a supermarket when he was attacked between 6pm and 6.45pm.
"I was walking to Pak 'n' Save to get a loaf of bread ... I've walked that path hundreds of times before. I didn't hear anything behind me."
He had nearly reached the painted boat sheds at the northern end of the park on the popular Loop walk when he was struck.
"I was on the ground and I felt a sticky wetness and put my hand down and saw the colour of blood. I called 111."
People went to his aid until a St John ambulance crew arrived and rushed him to Whangarei Hospital. He was stabbed between the shoulder blades and in the lower back, narrowly missing vital organs. A scan showed if the cut to the lower back had gone two millimetres deeper, it could have been fatal by piercing a kidney, he said.
He spent four days in hospital and is now recuperating at a property in Whangarei Heads. "The care I have had from the ambulance people, staff at the hospital and the police has been amazing. The police are very determined to find the person or people that did this to me. The officers have been just wonderful.
"The area where this happened and the Town Basin are real gems ... It should be made into the Venice of the North."
While physically he was mending well it would be some time before he would get used to someone approaching him from behind. The keen boatie, who is originally from England and did not see the ocean until he was 12, has had his yacht on the hard in Whangarei undergoing repairs for two-and-a-half years.
It also doubled as his home. He planned to get the vessel back in the water this summer but that would be delayed as he recuperated. Police had waited until last Thursday when the man had recovered enough to be interviewed. They were also looking at camera footage in the area.
Anyone with information about the attack should contact police at Whangarei station on 09 430 4500 or Crimestoppers on 0800 555 111.