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Photo: Mx. Granger, CC0 via Wikimedia Commons
Literally "lotus mountain", paved with extensive hiking paths. There's a temple not too far up.
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广东东江纵队纪念馆
A memorial museum dedicated to telling the story of the East River Column (also known as the Dongjiang Column), a Communist-affiliated guerrilla army that fought the Japanese during the Second World War and later took part in the Chinese Civil War. The museum is on a hill overlooking the historic village of Dawangling, which is where the East River Column's main base was located from 1940 to 1943. The village of course can also be visited and several of the buildings that made up the army base are open to the public.
松山湖 Sōngshān Hú
水濂山森林公园
林则徐纪念馆
Oddly enough, this confusingly named museum seems to cover everything about the opium trade except the Opium Wars. The biggest focus is on Lin Zexu's heroic 1839 campaign to destroy imported opium; the wars that ensued are scarcely given a mention. The museum has lots of interesting artifacts, though the labels and their English translations leave something to be desired in terms of precision. Next door to the left is Humen Story (虎门故事), a small museum of Humen's history. To the right is Yuxu Ancient Temple, a small temple that's more than 200 years old and thus saw both opium wars. Back toward the ticket gate and to your left, you will see the water-filled pits that Lin Zexu used to destroy confiscated opium, though the historical marker is in Chinese only.
东莞植物园
Beautiful, large, and well maintained botanical gardens. See lots of flowers and attractive landscaping, including Chinese-style gardens and ponds with fish. Labels are mostly in Chinese but regardless you can enjoy the scenery – this is one of the prettiest parts of Dongguan. It doubles as a popular park with a playground for children.