There are plenty of ATMs, banks and kantors (exchange offices) around the Rynek and along the main pedestrian street that trails south from the Rynek, ul Jagiellońska.
Bank PKO Bank and 24-hour ATM several blocks south of the Rynek.
Post Office Just off the southwest corner of the Rynek.
PTTK Office Less helpful than the city's tourist information centre, the PTTK office on the Rynek is a good place to source hiking information, buy maps and find out about possible overnight stays in PTTK-run mountain huts.
Tourist Information Centre Standard tourist office with limited information in English. There's a computer available for visitors to check email.