Appreciate the quiet ambiance of Princes Czartoryski Library while perusing the books, magazines and periodicals. You may be able to play some board games too.
When you've finished up at this Kraków Old Town collection of books, why not check out Main Market Square, Wawel Castle, and Oskar Schindler Factory? They're not too far from Princes Czartoryski Library and also popular with many tourists.