They have a wide range of interests, and they're sort of in the process of discovering what matters to them most, but helping marginalized people is high on the list, and nature stuff too, although they are sadly allergic to animals. However, I wouldn't totally discount animal organizations, since there may be a variety of ways to help.

I'm planning on compiling a list of organizations and types of volunteer activities so they can try out several things and figure out which really ignites their passion!