Summer Service

I am planning to have a month off between ending my fellowship and starting medical school. I would love to participate in some kind of service that would be rewarding and fun during that time. I have considered everything from volunteering in NYC to returning to Ghana, where I did my thesis research. I have thought about projects that are health-related or entirely health-unrelated (Farming through WWOOF?). But now I need to start actually planning. Any ideas? Has anyone worked on a service project they really loved that might be a good summer project for me? Please let me know!