I will be staying in the centre of Hamburg for a few days and intend to hire a bike most days. Having got hold of a cycling map I find out that there are many routes to choose from. Is there anyone with a knowledge of them? I'm not thinking of the tours which remain within the city but possibly exploring things like the Ox Route or the Lüneburger Heath. I will be near the main railway station and am thinking of using them to get to some routes. Alternatively, there seem to be a lot of possibilities near the river. Any suggestions?