After getting some food in one of the many restaurants at the "Aachener Straße" starting at "Rudolfplatz", you can enjoy the good weather and take a short walk around the tiny lake.
“Follow Ehrenstraße up Breite Str. (Dom) or down Maastrichter Str. (Belgian quarter) to find Arts- and Bookstores, Cafés, Fashion stores and Souvenirs”
“It is at Neumarkt, there you will find all major clothing brands (ZARA, H&M, Appelrath&Cüpper, Peek&Cloppenburg and many more) as well as numerous shoe retails...”
“Of course, a must see as it is the most famous spot in the city. However, I recommend you to not waste your money on paying admission to walk up the tower as the view is not great and pretty smelly up there.”
“A bit further afield but if you're in the Sudstadt this place is simply the best. You can thank me later.”