Berlin is very cycle friendly and it's a good way to get to know the city - there are specially marked bike lanes everywhere. There are also plenty of bike rental shops. West Berlin is wonderful for cycling, flat, with lots of cycle paths, parks and canals to cruise beside. East Berlin has fewer cycle paths and more cobblestones and tram lines. Cycles can be taken on the U-Bahn (except during rush hour. Children's seats can be rented as well.