When I was a kid, we made May baskets in school, then got to go on a field trip to the nearby woods to pick wildflowers to put in them. We'd either take them home to our mothers or hang them on the doorknob of a favorite friend or neighbor, ring the bell and run away.
We also did the May Day May pole thing at school.
I guess this kind of thing is lost and gone forever. That's sad. It was such a civilized and kind gesture.