If you're passing through those many downtown narrow streets, I believe you should stop by Museu de Artes and see what there is to look. If you are fond of arts, chances are something in display might be a good acquaitance.
Simple place, subject to schedule and chance.
Funnier things to see outside!
If you own or manage Museu de Artes Visuais, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.