Münster in detail
There are several banks in the centre, including a Sparkasse in the Münster Arkaden. Reisebank near the main train station usually has better exchange rates.
You can find more info on many of Münster's sites at www.muenster.de.
Münster Tourist Office The main office has plenty of info (much in English).
Tourist Office Historisches Rathaus A good source of information.