this is a beautiful translation of a beautiful poem. We had a tree house in our sycamore tree and spent hours in its crown. I will always associate tree-climbing with my childhood.
Do you know the short stories called “Los ninos tontos” by Ana Maria Matute? One of the stories in the collection is about a child and a tree but the book is packed in a box to which I don’t have access at the moment. It would fit well into this theme.