Walking from Brisbane to Melbourne he's on a journey, however, it's more mental than physical.

"It started for me with personal healing," he said.

"I had stage 4 cancer in 2016 and was given six months to live.

"I had a 40-60 per cent chance that chemotherapy could shrink the tumour, make it surgically manageable or completely get rid of it.

"I got lucky and it did."

While he was able to survive the cancer, Simon said having been diagnosed with the disease can be more mental than physical.

"It can hit your spirit and mind more than your body," he said.

"I couldn't bounce back, I wasn't thriving, I was slowly slipping into existential crisis and I remembered a time as a child I walked from Brisbane to Sydney to live with my grandmother," he said.

"It was to escape a bad domestic situation and it took me towards hope and that muscle memory made me think I needed to take another big walk."

Simon decided that if he was going to do another big walk he was going to find a purpose.

"I chose to super hero up for science - I've got my Captain Australia mask and it's all in support of The Kids' Cancer Project."

A noble choice of charity, the inspiration came from Simon's own experience sitting in chemotherapy waiting rooms, watching children prepare for treatment.

"It's heartbreaking, it's wrong, it's not on," he said.

"So with that project there's two dimensions; personal healing, repair and rebuild and helping the charity out."

With the pacific highway roaring down the east coast, the trek has changed significantly from his first walk as a child however Simon's not limiting himself to the long straight connecting Sydney and Brisbane.

"I've gone down the highway, it's a bit iffy at times," he said.

"I'm sleeping rough on the side of the road with a hammock and tarp there and it's constant barrage of noise so it's nice to get onto country roads and the beach.

"The compromise there is you're making less distance in the day and every time I make a choice that lengthens the journey I'm aware that it's taking me further away from my three kids.

"I miss them something fierce, I could've gone straight down the motorway and it would've been much shorter but I chose different routes because I'm not done with my healing yet, a lot of that's letting go of grief and thoughts you haven't processed and releasing it."

While being away from his children has been one the toughest aspects of the walk, being a better father provided more ammunition to start the journey.

"One of the things that motivated me to fix myself was I thought I was under-performing as a dad and that's one of the most important jobs in the world to me."

After sleeping between Clybucca and Gladstone on January 13, Simon will travel to Gladstone, Belmore River, Crescent Head and then walk via the beach to Port Macquarie.

The next leg will then work out itself with "a lot of country between here and Sydney."

He has been on his journey since December 26 and said experiencing the overwhelming kindness from people he has met along the way has been the most rewarding.

"I left on the 26^th of December because it's my birthday and is the same time of year I left on my first big walk at the age of 15.

"There has been tremendous kindness shown to me during the walk. Just the other night I had a leech in my hammock. I posted about it on my Facebook page and a local nurse came out to meet me to check me over and gave me some water and sandwiches.

"This isn't the first time something like this has happened, it's just the most recent."

With a Facebook page, Captain Australia's Big Walk, the journey has attracted a significant following.

"When someone puts me up and says they have a bed for me tonight, people watching love it, they get something from it and I couldn't have anticipated that at all.

"We've become a bit distanced from that basic idea that we are all kind, we are all trying to do the right thing and we are all good at heart."

Asked on whether he compares it to a walking meditation, Simon said there's certainly a difference.

"Meditation has this idea that it's taking you to a higher place and that you're achieving some sort of spiritual awakening but I don't know if me having Aretha Franklin jumping in my brain is a spiritual awakening," he laughs.

Although Simon has a long way to go on his journey, he said he's looking forward to what is ahead.

"I love that this walk has spread beyond me now. It makes it all worth it."

Donations to The Kids' Cancer Project can be made here or by stopping Captain Australia on his walk and using the QR code.

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