Start your tour with a visit to the Cologne Cathedral, located in the heart of the city. It is one of the largest Gothic cathedrals in Northern Europe and a UNESCO World Heritage Site. Climb 533 steps to the top of the south tower to enjoy the magnificent view of the city. Next, head over to the Museum Ludwig, home to an impressive collection of contemporary art. Admire works by Picasso, Warhol and Lichtenstein, among others.
Treat yourself to a tour of the famous Chocolate Museum, which showcases the history of chocolate and the process of making it. You can also participate in tastings and workshops to learn more about this divine treat. End your day with a relaxing walk through the Rheinpark, which stretches along the river. The park is the perfect place to enjoy a picnic or to watch the sunset over the river.
If you have more time, you can explore the Old Town area, which is filled with traditional German buildings, shops and restaurants. The Romano-Germanic Museum in the heart of the city is also worth a visit. If you're interested in history, take a trip to the NS Documentation Centre - a museum documenting the rise of Nazism and subsequent consequences in Cologne. If you have less time, you can consider skipping the Chocolate Museum, as it is slightly further away from the city centre. You may also want to consider taking a boat ride on the Rhine River, where you can enjoy the scenic views of the city.