Had 6 nights in Krakow recently and wanted to give some tips to others who may be going soon.
There is a tourist card available for 2/3/ days at 50/65 zloty which gives unlimited travel on all trams and city buses and entry into a number of museums... good value if you plan on using the trams to get about.
Visit to the Salt Mines and Auchwitz are musts. The organised tours are not that dear and avoid the queing for tickets.
Good food available at Sukiennce which is part of the Cloth Hall. Lovely food garden at Grill 15/16 and the American type food at Some Place Else which is part of the Sheraton Hotel is good too.
stayed at Novotel centrum which is very good.
You can pre book taxi to collect you at the airport when you arrive and this is a good idea until you get your bearings. About 60/70 zloty.
Thanks to all those who gave me advice about buying cigarettes. A word of warning... limited brands available at the airport so you may be best buying from somewhere like alcohole in the town in case your brand is not available.
Enjoy! Lovely place and lovely people.