One of the best ways to see Berlin is by bicycle. Berlin's flat terrain and vast network of dedicated bicycle lanes makes it easy to go anywhere in the city and its environs. There are literally hundreds of bike rental shops, which usually charge around €10 per day for a standard bicycle. However, if price is an issue, you can also rent a bike for free.
BikeSurfBerlin lets users rent one of its bicycles for up to 7 days absolutely FREE! Just reserve a bike on BikeSurfBerlin's website and hit the road. Now, you can see this fabulous city on wheels and get some exercise at the same time.