Van Stijn (73) will be accompanied by his 22-year-old granddaughter, Kayla, and, in an attempt to gain an edge over everybody else, he has also treated himself to a No 2 haircut.
"It all helps," he said.
Van Stijn emigrated from Holland in 1956, taking up work at the old Roslyn Mills as a loom tuner. A keen sportsman, he has been more focused on walking in recent years.
He walks rather than takes the car, and goes for a 4hr walk every Sunday.
"I'm not so keen on walking in the rain now, so I hope it is dry on Sunday. But it is only 20km."
This is the third time Stijn has walked the harbour event.
He did it in 3hr 33min two years ago and managed 3hr 38min last year.
"I'd like to go a little bit lower," he said of his time.
Earlier this year, van Stijn completed the Walk of the World, one of the most famous walking events on the international calendar, in Holland.
He had entered the event two years ago, but organisers called it off after the first day because of extreme heat and the deaths of two competitors.
Before that, van Stijn had only ever had one previous association with the world's premier walking event.
In 1955, he took part while completing two years of compulsory military training in the Dutch army.
The event coincides with a festival in the Dutch student town of Nijmegen.
The walk is a cloverleaf shape and comprises daily walks over distances dependent on age and gender.
For van Stijn, it included a walk each day of just over 30km for a total at the end of four days of 124.6km.
Younger people are required to do between 40km and 50km a day.
He estimated that it had a field of "a couple of thousand" when he first competed in 1955.
This year competitor numbers were cut off at 45,000, with organisers once again receiving entries from all around the world.
Because he competed this year, van Stijn has an automatic entry into next year's Nijmegen Walk, but has yet to make up his mind whether to accept it because of the expense. "It's a long way away you know, and of course there is a lot of training involved."
If van Stijn does not accept his right of automatic entry for next year, he will then have to go back into a ballot to contest any future event.
