The Oamaru couple recently spent three and a-half months in South America, where they sponsor six children, seeing first-hand the needs of the people, particularly children, that they intend doing something about.
At a school in Chigorodo, Colombia, about $NZ15,500 was needed to complete two classrooms and a toilet block to enable a further 150 pupils to attend school.
Back in 2006, Mr Walker published three books - Die Old, Die Well; Die Old, Die Rich; and Die Old, Die Happy.
The couple now want to give the proceeds from 1000 copies of the books, each selling for $15, to that project.
Another project they wanted to see happen was the creation of parks for children to play in.
A school was only a building, with no area for play.
"Every kid needs to be able to play. These kids would play all day if they could. It would be so good for them," Mr Walker said.
They also wanted to see posters on the walls of classrooms, as they were now blank.
Mr and Mrs Walker, who left New Zealand on May 15 and returned home at the end of October, visited 16 countries, including 11 in South America.
They had 34 flights in three continents, stayed in 56 budget hotels and hostels in 62 cities and went from Sao Paulo, with a population of 20 million, to Buenos Aires, where there were 17 lanes of traffic in the main street.
They had previously been to South America in 2007 and were so taken by what they saw and the needs of the children that they came back wanting to do more.
The children they met were "wonderful" and very respectful.
"We would love to sponsor every child in South America. Realistically, we can't," Mr Walker said.
While people had warned that Colombia was going to be dangerous, they found the people in Colombia to be "wonderful".
They visited places that were termed very dangerous - "we went into places most people wouldn't see" - and were escorted at all times.
"We did it because we love kids," he said.
