"I'm running partly because my mum is doing the 10km and has been training really hard. She has always supported me, even when it means I am only back once a year at most, so I want to come back to support her and share the experience together. I don't get to see my family much, so it will be nice to be back together with mum, dad and my sister, even if it's just for a few days."
Wallis is downplaying his chances on Saturday, but it is that relaxed frame of mind that might set him up for a good day on the 42km course from Marine Parade to Sileni Estates.
"I'm just coming to have some fun. It's been a long season for me and I'm due some rest, but I'll use this as a bit of a training effort and see how it goes out there. I think this will be the first time in about 10 years that I have run a race in Hawke's Bay."
Wallis knows that the atmosphere at the Air New Zealand sponsored event that takes runners out of town and through the local countryside and wineries will be somewhat different to Chicago.
"I have run some pretty amazing races around the world, but nothing compares to Chicago. There were over one million people along the course, and at times the sound was deafening. I was running by myself for most of it, so when the crowds erupted it really did give me a massive surge of adrenaline."
Marathon contenders include another old boy in Will O'Connor (St John's College), who has recently made the shift from triathlon to long-distance running and is experimenting with a run/walk theory this Saturday. The Massey University student has just submitted his PHD in sport and exercise and is looking to improve on his sixth place last year, when by his own admission, he had a "shocker".
Last year's runner-up Chris Sanson (Manawatu) returns to see if he can go one better and does so on the back of a solid performance in Rotorua, where he finished second in 2:27:11 - a personal best time.
Auckland-based Luke Hurring is another to watch. The former Canterbury University runner comes from a track background initially, but has extensive marathon and long-distance experience.
Like many, his reasons for coming to Hawke's Bay are as much about the destination, as they are about the actual race.
"I have not spent much time in the Bay, and so the event had immediate appeal when it was first launched as a destination, and my sister and her family moved to Napier this year so it was a great chance to visit.
"I've heard the course is not as easy as it sounds, but I'm a bit of a wine geek so I'm looking forward to the prospect of running through some vines. I'll be bringing the family down and we will be looking to catch up with family and friends and get to know the region as much as we can over a couple of days."
The full Air New Zealand Marathon gets under way from Marine Parade at 9am on Saturday morning, with other events starting earlier in the morning from different start lines, but all making their way to the finish line and the wine and food festival at Sileni Estates Winery.
Air New Zealand Hawke's Bay International Marathon - by the numbers
* Close to 5000 entries expected (entries remain open until 9pm Friday May 12)
- 67 per cent female, 33 per cent male
- 76 per cent from outside the Hawke's Bay region.
* Air New Zealand putting on nearly 1000 additional seats on flights into Hawke's Bay to cater for the influx of visitors.
Race distances and start times include (all events finish at Sileni Estates Winery):
7.45am, 10km race, Gimblett Gravels Wine District.
8.15am, New Zealand Sotheby's International Realty Half Marathon, Pakowhai Regional Park, Hastings.
9am, Air New Zealand Marathon, 350 Marine Parade, Napier.
Kids Run, 1pm, Sileni Estates Winery.
For more information on the Air New Zealand Hawke's Bay Marathon visit www.hawkesbaymarathon.co.nz