Oder river boatride in Wroclaw
One of the most relaxing things to do in Wroclaw is take a ride on the river Oder. There are several harbors where you can board, and I love anything you can arrive at spontaneously without booking ahead. I got on a Tourist Harbor. Despite the name, it wasn't crowded at all (on a weekday). The boats are dog-friendly in case anyone's wondering (Wroclaw is pretty dog-friendly overall). The ride I took was about 45 minutes and a nice combination of the old town seen from the water and more natural parts of the riverbank. Especially pleasant if you need to cool off on a hot day or sit for a bit after walking around looking at things.