Simplest of outdoor play… let your child take their inside toys outside. My only constraint? I don’t allow toys with small pieces that can get lost (Lego‘s) or items that can roll under the deck (Marble Run, Hot Wheels). When I was a kid, I loved to take my Barbies outside. They would frequently go camping, swimming, rafting, and hiking.
I wish I knew what my son was thinking in the first picture. Frogs against the farm animals? Wildlife on one side of the fence, farm animals on the other? Probably simply organizing. Kids love to put things in order!