Just make sure you complete the route before your pass expires. STA, Council Travel, and other travel agents can provide Eurobus information and application forms. A number of conservation and development groups take volunteers worldwide each year to participate in hands-on and community building projects. For example, you can teach English in an Italian hill town, help with reforestation projects in Indonesia, or paint a community center in Jamaica. Global Volunteers runs programs in Asia, Africa, Latin America, the Caribbean, Europe, the Pacific, and North America.
Projects place heavy emphasis on cross-cultural understanding, with an aim to build world peace.
You may also want to consider Habitat for Humanity International, which works with local families building and rehabilitating homes to upgrade housing conditions, help eliminate homelessness, and build strong community ties. You might find yourself constructing a home with a family in a small town in southern India or working on a community home in a Mexican village. I'm a British expatriate living in Tokyo. Recently, I met an American woman traveling through the country on her own. She belonged to a travel club through which she was able to stay with Japanese families for several days at a time.