As my son is going to pre-school, I have been busy with various sorts of art activities for him. Thought will share if anyone also needs ideas.
For 1st show and tell, I had made different types of farm, see the images below. The teachers loved it and kept it in the school to show to other children also. I made it in the form of a book.
This is really great for kids learning and you can always add lot more farms here like paddy farm, crop farm, etc.
For 2nd turn, I made a scarecrow, it was fairly simple, but was super fun to make it with him. He got to do painting and cutting, and I stuck up everything.