For example, for my kids, they would go home and find out how many different kinds of liquids are in their house. I would make sure I would tell them not to open any of them up. They just needed to name them. It would be a great categorizing exercise and there could be some graphing involved. Artists could do the same thing but put a sample of it in their journal. Food items would be drawn or listed to avoid bugs liking the journal. Another example would be the kids picking up different leaves or rocks on the way home.
My kids live on actual city block unlike me, I live in a subdivision. This would make a good scientific write-up. Purpose would be to see if there were the same number of houses, cars, etc.. on both sides of the street. They would write their hypothesis at school. They would count the number of whatever on each side of the block. They would make conclusions as to why it was the same number or not. Maybe, they could come up with some investigation ideas of their own. I can hope!