On Saturday, the Lake Illawarra man will walk 52 kilometres from Sea Cliff Bridge to Windang Bridge to raise money for the KidzWish Foundation.

"I've got three or four families I've known for 20 years that have kids with special needs and I see how hard it is for them at this time of year," he said.

"One of my friend's kids has had a brain tumour since he was born. He's had it removed a few times and now he's going through radiation treatment."

The 43-year-old will set out at 6am and estimates he'll arrive at Windang Bridge between 4pm and 5pm. He's raised $1800 so far and is aiming for $2500.

Having had his own health problems, he hopes to inspire others to make a contribution.

"I had a mini stroke four years ago and was lucky enough to still be able to work and do things," Mr Hamilton said. "I thought if I did a walk then maybe more people would get involved.

"I want to show people that age or having a stroke isn't a barrier, because if I can do it so can others."

Despite the training he's done, Mr Hamilton is anticipating a fair bit of pain from his walk.

"They reckon on the Monday I won't be too bad because your body still has a lot of adrenaline pumping through it.

"It's the second day where your body tends to shut down a bit."

Donations can be made here.