And it's not too late, ever, even when most of these things are pretty silly for grown-ups.
But silly is good :-D
National Trust's 50 things to do before you're 11 3/4
101 things every child should do before they grow up
51 things your child should do before growing up
30 Things Kids Should Do Before They Grow Up
Bucket List for Kids: 101 Things to Experience in Childhood