Cologne, great city but not many things to do
I stayed in Cologne for 2 days. The first day I've seen the important things, which were great: Dom, Love Bridge, a few museums, town hall, a few churches, the gate and even things like Neumarkt Galerie. All in all it's a great city, but as soon as you've seen the important things, there's not much to do anymore. The second day we've been to the region where the cable car is and the zoo, as well as the botanical garden.
Insider Tip:There's a great place, called Eiscafé which is close to the Dom. I purchased a breakfast there at 11:00 AM for €5 but it was so much that I actually brunched. I even drank a glass of Prosecco as breakfast!