Joining the Peace Corp is a big commitment and is not open to non-US citizens. However, there are many organizations offering similar long term volunteer opportunities.
Visit the following organizations offering Peace Corp alternatives:
Lisle - Provides intercultural programs and service learning opportunities abroad.
The Borneo Project - Partners with communities and local organizations that document and map ancestral land claims, litigate to halt forest destruction, teach villagers their rights, market traditional handicrafts, reforest degraded areas, install microhydro electrification, and protect Borneo's incredible biodiversity.
Earthwatch Institute - An international non-profit organization supporting scientific field research and offering members of the public the opportunity to work with distinguished field scientists.
i-to-i - An established volunteer organization offering volunteer opportunities in twenty three countries worldwide.
Amigos de las Americas - Offers volunteer opportunities for young people around Central and South America.
Global Volunteers - Global Volunteers mobilizes some 150 service-learning teams year-around to work in 19 countries on six continents.
Volunteers for Peace - Offers a myriad of low cost volunteer workcamps all over the world.
Global Service Corps - Working with local communities to restore culturally important structures, and promoting responsible tourism through "volunteer vacations".
Altruistic Adventures - Plans and hosts expeditions and volunteer service projects around the world.
Amizade - Offers service learning courses to graduate and undergraduate students with communities around the world.
Global Citizens - Sponsors teams of volunteers wishing to learn from and work with people in other cultures.
Cultural Restoration Tourism Project - Working with local communities to restore culturally important structures, and promoting responsible tourism through "volunteer vacations".