Hi MurrayTheMonk that was me, perhaps amongst others.
We went to Krakow in March the year before last and had a fantastic time. We are very interested in history and had a lot planned around that, so if that interests you, we visited the following:
We stayed in Kazimeriz, the old Jewish Quarter, it's really interesting and full of old building and lots of cool bars / restaurants.
We had a drink in a bar called 'Once Upon A Time in Kazimeriz' which is 4 old trades peoples houses knocked together into one big room but one area is the baker, the butcher, blacksmith and tailor. It was fun and interesting.
We visited Schindlers Factory which is now a museum of the history of Poland and it is really well done.
From there we went into the Jewish Ghetto and saw Heros's Square and the Eagle Pharmacy - now a museum and really worth visiting.
The main Square is fab and has the cathedral and the old market building - make sure to schedule in a stop at E. Wedels Chocolate Shop for hot chocolate with a nip of brandy / whiskey in it - delicious!
Have a coffee / beer in the Bunkier Cafe in the Planty Gardens
We ate in really good pizza place one evening but there are lots of them and we had an excellnt steak in Moo Moo Restaurant in the Old Town - terrible name but really good food!
We spent a day at the Salt Mines and I'm glad we saw it but it wasn't really my thing.
Hope you really enjoy it as much as we did!