Three things
Here are 3
Pick one. Each takes about as long as it says.
Return it better than you got it
The borrowed car with a full tank, the returned dish with something in it. The margin is what people remember.
Half an hourUnder $10A neighbor
Invite the new family twice
The first invitation is often declined out of uncertainty. The second is the one that establishes it was real.
5 minutesFreeA neighbor
Go to the celebration that is not yours
Turning up to somebody else's festival, service or national day is a bigger gesture than it costs you.
An afternoonFreeA neighbor