If you want people to walk, you got to make sure they can sit. At first glance this appears a contradiction, but walkable cities need many places for people to sit.
People and especially elderly are willing to walk further and forego a vehicular trip if they know there is a place to rest half way. It also makes the city friendlier.
Well placed public seats allow people to relax. It creates opportunities for incidental encounters which are important for community building. It makes the city more accessible for people with disabilities.
So how far are you willing to walk? Ever wondered why there are not more seats around our city in public areas?