Throughout the entire city it is possible to ride a bike, plus it has many areas where there are paths suitable for cycling or running, One that I liked is the path that surrounds the 2 Alster lakes. Cycling is popular in Hamburg, but do not think of the chaos of Amsterdam, it has nothing to do, the volume is much lower and more controlled. As a tourist without a bike, there are many places in town where you can rent one, the usage is easy, register your credit card and you can use the bike for 24 hours and it is the best because you can stop in many places. The passage of the card is just to charge you a kind of fee (I think it was 5 euros) because the bike is really free, if you return in good condition you those 5 euros paid on account. Do not hesitate, Hamburg is a beautiful city, and cycling is one of the best options to get to know it.
From Echterdingen, it's about 15 kilometres to Vahingen. Although it's a tremendously industrial area, I don't know how they do it, it's possible to travel from one place to the other without seeing a single road through orchards, cottages and beautiful paths. Through the farms, nurseries, cyclists, plantations, and groves, it doesn't seem to be one of the most industrial areas of central Europe. In less than half an hour, without much effort, you can enjoy clean air and a path with no noise, just special.