When my friend and I saw a special offer by our national railway company the NS for a day trip to Cologne, we immediately booked the tickets, since we had only heard such positive things about the city. After having visited myself I definitely understand why nobody's complaining! The beautiful station is a sight to see in and of itself and a wonderful way into the city, and when you walk out the doors you get to take in the sights of the gorgeous Kölner Dom immediately! If you are physically capable please do climb it, for the views are breathtaking and very well worth the energy. Köln is a great city for some serious shopping, after which you'll be able to find a good meal in any price range. At dusk we walked the Deutzer Brücke to enjoy the views of the Kölner Dom and picturesque houses from accross the river, after which we walked the love-locked Hohenzollern Brücke back, right into the station on time for our train!