There are tons of community service opportunities out there! You can help build & repair houses with Habitat for Humanity. You can volunteer at an animal shelter. You can help out at a soup kitchen. You can start a recycling program at your school.

Try a web search for sites like this:
VolunteerMatch: Where Volunteering Begins

There's a big national drive for volunteers that started in the US after 9-11... I can't think of the name! Anyone?