Know Berlin differently
A healthy and cheap way to see the city in the company of a guide who speaks your language. This system ensures that you get to know the city by bicycle following a good experienced guide, with this method the company have made more than 100 tours to date and their experience shows. Although there's no tip to pay I think it's important as the service is good and we must thank the service provided. So you know, ecological, interesting and inexpensive tourism is possible.