John Simon and his 9 year old son Lucas are walking the length of the South Island, 1200 kms (745.6 miles), to raise money for Room To Read, a charity that aims to raise money to improve literacy in developing countries.
See their journey on their website http://www.walkingwithdad.com or follow them on Twitter at @walkingwithdad1
Room to Read 
"Room to Read Australia Foundation is a global organization 
seeking to transform the lives of millions of children in the developing
 world by focusing on literacy and gender equality in education. Founded
 on the belief that World Change Starts with Educated Children, Room to 
Read works in collaboration with local communities, partner 
organizations and governments to develop literacy skills and a habit of 
reading among primary school children and to ensure girls have the 
skills and support needed to complete their secondary education.  Since 
2000, Room to Read has impacted the lives of more than six million 
children in Asia and Africa and aims to reach 10 million children by 
2015."
http://www.roomtoread.org/
If you want to help this worthy cause head here - http://www.everydayhero.com.au/walkingwithdad
"Room to Read Australia Foundation is a global organization 
seeking to transform the lives of millions of children in the developing
 world by focusing on literacy and gender equality in education. Founded
 on the belief that World Change Starts with Educated Children, Room to 
Read works in collaboration with local communities, partner 
organizations and governments to develop literacy skills and a habit of 
reading among primary school children and to ensure girls have the 
skills and support needed to complete their secondary education.  Since 
2000, Room to Read has impacted the lives of more than six million 
children in Asia and Africa and aims to reach 10 million children by 
2015."http://www.roomtoread.org/
If you want to help this worthy cause head here - http://www.everydayhero.com.au/walkingwithdad