You will find bars and restaurants in the Kazimierz (Jewish) district are generally cheaper than old town, it’s only a short walk from one to the other. Saying that Pijalnia is a great little cheap bar in the old town.
The Kazimierz has a few historical sights if your interested in seeing them, like a small amount of the old ghetto wall and heroes square, Schindler’s factory is worth a visit which isn’t too far.
There is a castle to see and it has some big old churches/cathedrals. Just wandering around the old town and Kazimierz is a nice way to spend a few mornings or afternoons.
Auschwitz is a harrowing place but is well worth visiting, it’s a full day trip out of Krakow, as is the salt mines that you can visit.