Drop off flowers to a nursing home.
Mow your neighbor's lawn.
Buy someone's meal.
Send an unexpected gift to someone.
Pay an expired parking meter.
Send someone a handwritten thank you card.
Send a care package to a service member.
Leave a generous tip.
Pay for the coffee order behind you.
Raise funds and purchase items from a teacher's wish list for their classroom.
Drop off a meal to a new parent or someone who just had surgery.
Shovel your neighbor's driveway.