The development concept of City Parks in Bandung has been forgotten, due to the lack of green space avaibility that houses the citizen to do social activities. The existence of Public Open Space is important as complementary elements of a city that serves as the lungs of the city. In the Dutch colonial era Bandung City's Government applies Garden City concept that intended to anticipate the rapid development of Bandung city in the future, one of which is Ganesha Park. Ganesha Park was built to commemorate the services of a prominent founder of ITB, Dr. Ir. A. W. Ijzerman, so the formerly name was "Ijzerman Park". The park was designed aesthetically not only to absorb pollution but also as the beauty of the city to give freshness in daily routine. Ganesha Park currently function as Public Open Space in which the beauty and comfort makes many visitors come to the park to do various activities. This study will observes functions and activities that happen in Ganesha Park that can support activities of people around. This Public Open Space has important role for the citizen of Bandung in particular, because this POS serves as a place that can be physically and visually accessible by people, so people's various activities can be done at the Park.