There's often a ton of things people can do where they are, as well. If you get involved in local politics, join a community arts project, get involved in neighborhood rehabilitation, join a dancing group, etc. You often see a side of things you never realized was there.

You get a different experience from "outside looking in activities (travel, overseas volunteer work, habitat for humanity) than you get from activities where you see yourself as being a member of the group you're trying to help or create something with. Both kinds of experiences can be useful, though it's important to understand the limits of each.