From Gran Canaria airport. Take bus no. 60 to the Central Bus station of Las Palmas (San Telmo). From there, take bus no. 206 (Las Palmas-Bañaderos-Arucas) and get off one stop before the Bus Terminal in Arucas, and you will be in front of the Garden, in road GC 330, next to the main façade of the Palacete de la Marquesa.
From the city centre. Take bus no. 205 (Las Palmas-Tamaraceite-Arucas) to the Bus Terminal in Arucas and from there, take bus no. 206 and get off at the first stop.