On a relaxing summer day, Aachener Weiher is usually packed with Colognians. Bring a picnic blanket, a few beers, maybe a barbecue, and come to enjoy some sun while people watching. Located within the bigger Hiroshima Nagasaki Park, Aachener Weiher also has a small [biergarten](http://biergarten-aachenerweiher.de/) if you don't feel like grilling sausages for yourself. The park is also lovely for a stroll, wether with a bike or on foot!