DP and I are away in Porto atm. I posted a while back about whether to go for 3 or 5 nights. We went for the 5 nights in the end but I think we're going to struggle for things to do by the end. We've already done a tour of one of the Port lodges and visited the bar area of another. We've been up the Torres dos Clerigos and been in the church joined to it, been in the cathedral, visited a few cafes, the bookshop (livraria lello), walked around Jardins do Palácio de Cristal. Tomorrow we may get the tram to the beach.
What else is there to do?