Books, as above with a note to tell the next person they can read it and ask them to d the same when they've finished with it.
Newspapers etc on a seat closed ready for the next person to take.
On a recent visit to Waikiki I had such good service at a small coffee shop COFFEE BEAN and TEA I think that at the end of my treip I asked the girls if they would like the 6 novels that i had read they said they would like them to put out for other customers and usually they return them or put some of theirs on the shelf in return.