Of all the reasons I can think of for this sort of cultural phenomenon, tradition, climate and normal trail surfaces, are likely explanations, but poverty is also a likely reason too.
You can read about Tonga here
http://www.lonelyplanet.com/destinations/pacific/tonga/culture.htm
and here
http://tongaescapes.com/ has lots of links too.
Hope this helps you!
Edited by NHolmes on June 15 2005 at 6:41pm
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