There is a Taxi Drop-Off and Pick-Up point at the Visitor Centre along Cluny Road. By Coach: a) Coach Drop-off Point is located at the Singapore Botanic Gardens' Visitor Centre, the Ginger Garden Coach Drop-off Point and Jacob Ballas Children's Garden. b) Coach Parking is available at the Singapore Botanic Gardens' Visitor Centre, Tyersall Avenue Public Coach Park and Jacob Ballas Children's Garden. By Mass Rapid Transit (MRT, Circle Line): Alight at Eco Garden (North end of the Gardens) via the Botanic Gardens Station. This new station along the Circle Line brings you closer to the junction of Bukit Timah and Cluny Park Road and provides you access to the NUS School of Law. Bus services near this station are similar to the ones along Bukit Timah Road.
Full article: http://www.sbg.org.sg/visitorinfo/openinghours.asp