Play is often talked about as if it were a relief from serious learning. But for children play is serious learning. Play is really the work of childhood.
I wonder what memories of yours will persist as you go on in life. My hunch is that the most important will have to do with feelings of loving and being loved - whoever's been close to you. As you continue to grow, you'll find many ways of expressing your love and you'll discover more and more ways in which others express their love for you.