If you have watched famous Chinese movies (esp. historical ones) they are based on the themes of life in Hutongs (old lanes/alleys). Exploring the history and culture of China while walking on these preserved historical places and riding the rickshaw is really worth doing in Beijing.
Do not miss this place as most of them are already being replaced by modern residences! You can also see hutongs in museums but experiencing and hearing the story of the place from the old folks from the time of the Cultural Revolution is really interesting.