Here are a few ideas:
1 - Pay the toll for the driver behind you.
2 - Offer to pick up groceries for an elderly neighbor, especially in extreme weather
3 - Put a coin in an expired meter
4 - Help a mother carry her baby stroller up the subway stairs, or hold a door open for her
5 - Surprise someone with a cup of coffee
6 - Let a fellow driver merge into your lane
7 - Return your shopping cart to the cart station
8 - Forgive someone a debt–and never bring it up again
9 - Throw away your trash—and someone else's—after a movie, picnic or visit to a park
10 - Share your smile with everyone you meet today!