Many of the following non-profit organizations offer volunteer experiences that promote cross-cultural sharing and understanding within the context of community. Volunteers often work in small teams,living and working with hosts of the country. Projects may include a clinical and community health component.
As a Registered nurse, for example, you might prepare community health education presentations to secondary school students on reproductive health, STD's and HIV/AIDS.
These trips can be expensive;volunteers usually pay all expenses, including air and living expenses in addition to a fee for participation. Nevertheless, the sites are interesting and may just be what you are looking for. Additionally, these sites usually offer links to other site you may find useful.