How artsy craftsy are you? There's always a call for hand-crocheted blankets for hospitals, nursing homes, and such places. You might could find a local crochet, knitting, or sewing circle and work with the people there in mini marathons making stuff for the local needy.
If there is a Meal On Wheels kind of place, perhaps you could help deliver food to those who need it? Similarly, is there a nearby soup kitchen you could work in?
Some of my local thrift stores are always looking for volunteers to help sort goods to put out on the shelves.
So, are you a real felon, or just somebody stuck with a felony label because you tripped over a mailbox or something inane like that?