Babysit for couples or single parents who don’t get out much, so they can have some alone time. (Especially needed as the holiday season approaches!)
Help the weary shopper in front of you who needs that extra two or three cents to avoid breaking a 20-dollar bill.
Put some change in an expired parking meter (where it’s legal).
Post inspirational sticky notes around your neighborhood, office, school, etc.
Take flowers or treats to the nurses’ station at your nearest hospital.