I am an intermittent nomad with a home base in New York City.
I run the New York City chapter of a small nonprofit called Not Just Tourists, as well as working for a private investment firm.
Not Just Tourists provides travelers with a free suitcase of donated surplus medical supplies (ie perfectly usable items would have been thrown away) to give to underserved medical clinics in regions they are visiting. Bringing a suitcase is a great way to both give back and interact with the community where you are visiting.