From my experience, volunteering directly helping people has been highly rewarding. Ideally, find somewhere you can volunteer the specific skills or interests

From my experience, volunteering directly helping people has been highly rewarding. Ideally, find somewhere you can volunteer the specific skills or interests you have to help people who otherwise wouldn't benefit from what you can bring to the table. Ideally, it would also be physically active and interfacing directly with others in some way. (And not too closely related to what you do for your day job.)