The Girl Scout song goes,
"Make new friends but keep the old.
One is silver and the other is gold."
… but sometimes we can't "keep the old."
The idea of heaven is much more of a paradox than it is a paradise. The world would be a better place if people would come to terms with the idea that Earth is an extraordinary place in the universe. It is one of the very few that supports life as we know it.
It is through play that we nurture our imagination, creativity, and ingenuity. If you give a child the opportunity to play, along with the playfulness, he will carry those characteristics into his adult life.