Go to Gelsenkirchen on saturday evenning and see if you can catch the atmosphere of the best club in the world
i think there a few mcdonalds you can try there
I heard there's a CS event there at the moment
Buy some good cologne from there, eat Halve Hahn and drink Kolsch.
Drink Kölsch and eat döner
It was most boring city I ever visit. I did everything tourist worthy in less than 1 day including the zoo. I visit IKEA for meatball and also the local prison. Rest of the time I eat shit food that isnt Germen and drink alcohol while riding between on the electric scooter. Nothing good in germeny.
Café BO for breakfast
Visit a "Brauhaus" get some Kölsch and eat some typical traditional german food (for examle here: Gaffel am Dom)
Visit the old town.
go to the biggest whore house in europe or in the world thats in Cologne!
I just saw weather predictions and its gonna be rainy all week, lol
You got Phantasialand, one of the best European theme park, in Brühl, only 25km from Cologne. Big thrills and unique attractions and nicely themed areas. Plan using a whole day to visit it, if you can stay whole monday for exemple.