do you mean Krakow Poland?
If so, travel agency will not be necessary. There is a company that does free walking tours in Krakow. At the Ibis hotel you can get a free guide book called Time Out Krakow that is full of useful information (I think it's also available at the tourist office for a fee).
Must sees: the main square, Auschwitz-Birkenau concentration camp, catch an evening concert
Food there was awesome and cheap - you must try a "milk-bar"!
hope this helps