If you really believe it is more blessed to give then to receive - or if your kids love May Day - you'll like this one.
Buy or make a small ornament, then wrap it festively and leave it on a stranger's porch with a note saying that it's a gift from their Secret Santa. Ring the bell (or knock loudly) and run!
Who knows? Your small act of kindness might send a ripple effect through your whole town - it will at least be something that stranger's family will talk about for years to come!