We were in Poland last May-June and used Visa and zlotys. Poland has not transitioned to Euros yet, although a few places will accept Euros. As for things to do, you will have no problem! Take in Wawel Castle, the fabulous Market Square, the newly renovated medieval Cloth Hall, Kazimierz (the Jewish quarter undergoing a renaissance), Schindler's Factory (now a museum), art museums, Chopin concerts, wonderful restaurants. The architecture of the old town is splendid. Hire one of the many horse-drawn carriages and take a tour. Enjoy St. Mary's Basilica and its famous towers, from one of which issues the famous hejnal, played by a trumpter every hour on the hour. Consider a trip to Wieliczka, which has an amazing salt mine. This is just a small list. We LOVED Krakow and hope to go back. Enjoy yourselves! Kathleen Bowman