Children love to look for all kinds of secluded corners, arrange huts, that is, arrange their personal space, where adults are prohibited by adults. You can arrange a house on a tree-house-nest. For example, on an old glogue apple tree, at an altitude of about 1.5 meters, arrange a platform from the boards, having strengthened it well with additional supports. On the platform to build a light wooden house, looking like a hut of Baba Yaga. You can climb the house on the stairs with the railing, which should withstand the child and the adult.