Mine have a few things in their run which they seem to like.
1. Old Tree Stump........they love pecking it to find insects in the wood, and they also like climbing all over it. Sometimes they like to rest under it for shade.
2. Area of sand.............they like to dust bath in it and scratch about.
3. Old wooden crate...........they love to fly up onto the top...particularly the roosters!
4. An area of grass...........like to peck at it.
5. They love it after it has stopped raining to paddle in the puddles and scratch about in them!
6. You can hang up a whole cabbage for them to peck at.