Fireflies!!!!!!!!!!!!!!!!!!!!!!!!!!! Just that first sighting each year & having a jar full for a short time....
(I'm 60 and must admit that, when I walk about town at night, I do get on the swings in the playgrounds---I haven't jumped off in mid air for a while....hmmmmm. And I swing over the bars...)
Cartwheels! I did the best ones ever. Can still stand on my head but it isn't quite the same.