Kraków is a city in the south of Poland.
Getting to Rzeszow, Przemyśl, Ukraine
Easy ... Take minibus (so called marshrutka) from main post office (corner of STAROWISLNA and WESTERPLATTE streets) to WIELICZKA (2,5 PLN ~ 0,7 EUR) and ask driver to let you out at the end of the city (the place where already Wieliczka starts...). There is a bus stop and plenty of space to stop even a truck. Look at the picture below.