Hong Kong Zoological and Botanical Gardens [1864- ]
The gardens' website has a brief history, including:
HKZBG [...] was founded in 1871 as a Botanic Garden and renamed in 1975 as Botanical and Zoological Gardens to reflect the increased commitments to zoological exhibits. Construction works of the Garden started in 1860 and the first stage was opened to the public in 1864.
It's still a pleasant area to stroll around. If you have young children they'll enjoy seeing the animals, and visiting the playground.