The biggest and well saved Medieval plaza in Europe! Lonely Planet's no.1 choice: the most beautiful European city market! Wonderful atmosphere - summer and evenings. Always fulfilled with tourists.
The first UNESCO World Heritage List from 1978 year had only 12 the most valuable objects from around the world. One of them was Krakow - the Old City, the Royal Wawel Castle and jewish Kazimierz.
There is a quite cheap and a bit "hidden" coffee bar with beautiful view on the main market. Just walk into museum in Sukiennice (building in the center of market) and go upstairs on the second floor.
It has an amazing and charming atmosphere and architecture here is the best! You should visit Cafe on the second floor of Sukennice it has a normal prices in comparison with other restaurants on Rynek
A must-to is visit to museums, both the underground one to inform about history (~1,5h) and the one at first floor of Sukiennice (image) where you can educate about polish art in 4 time periods (~1h).