I have just arrived in Köln for the summer, and am hoping to get tips for things to do here (I've already seen the Dom and walked around that area of town). I speak some German, and am here to learn German. I am living in Bergisch Gladbach (5 minute walk from the bahn) and working (pay free) for a dentist in Köln Tuesday - Thursday, which gives me plenty of time to travel the surrounding areas. I ordered my EUrail card already (15 days in 2 months). I have heard great things about the surrounding areas, but not so much in Köln... Any ideas on the MUST SEE places in Köln? I'm here by myself, so I'm also looking for good places to see, eat (lunch or dinner), etc.
Thanks!