volunteering
There are many charitable organisations and NGOs operating in Vanuatu, and a strong community of volunteers in the area. If you are interested in volunteering in Vanuatu, the following organisations place volunteers there:
Peace Corps (http://www.peacecorps.gov/)
VSO (http://www.vso.org.uk/)
Oxfam Australia (http://www.oxfam.org.au/w...)
other work
Many people from overseas work in Vanuatu, either running their own businesses or employed by others.
Generally speaking, work permits are only available for positions where there are not enough ni-Vanuatu to meet demand.