Do some people-watching at Surabaya Town Square. If its well-trodden pathways could talk, this historic square would have plenty of stories to tell.
You'll be spoiled for sightseeing choice in Wonokromo. Surabaya Town Square is a good place to start here, but there are plenty of other interesting spots to consider. Tunjungan Plaza, Pakuwon Mall, and Surabaya Zoo are near the public square and and will cap off your day nicely.