Plan a date where the two of you get to be kids again.
Go to a playground and push each other on the swings and merry-go-round. Climb the jungle gym, play hopscotch, jump rope or walk using stilts. get a big pad of paper and crayons and draw each other.
Trade stories about your childhood: What were your favourite toys, which teachers did you like best and what kind of trouble did you get into. Pack your favourite childhood snacks. My personal favourite is -Flings and Fizzers!