The zoo has not expanded beyond the original 28 hectares. However, 40 hectares of secondary forest were later developed into the Night Safari. The remaining undeveloped land has been kept as wooded land. This and the waters of Upper Seletar Reservoir contribute to the Zoo, giving it a sense of natural, unrestricted space.
The zoo also has a "friends of the zoo" programme, where people can sign up for a yearly pass which grants them special privileges such as:
Free and unlimited entry to Singapore Zoo for whole year
Free Zoo tram rides and parking
A free once every 3 months "Wildlife wonders" magazine
10% discount at some participating retail outlets
Among various attractions that the zoo offers, a highlight is the "Breakfast with an Orangutan" programme which allow visitors to meet and interact closely with the orangutans in the zoo, including the famous primate Ah Meng who is an icon of the Singapore tourism industry. Animal shows, as well as token feedings coupled with live commentaries by keepers, are also the daily staple in the Singapore zoo.
The zoo also offers various modes of transportation within the premises: trams, buggies, and horse carriage rides. Additional modes of transportation which can only be rented include: strollers, motorised wheelchairs and wheelchairs.
Singapore zoo also can facilitate weddings, banquets and private events at the Forest Lodge.