When talking of Chinatown, the first impressions is that it is a place founded by the Chinese and the facilities there caters only for the Chinese. Hence, there should be plenty of Chinese temples which is correct.
One of the biggest temple in the area is the 天福宫 Thian Hock Keng temple in Telok Ayer Street. This temple was built in 1839 and completed in 1842 by the Hokkien and is dedicated to Ma Zhu the Goddness of the Sea.
One of the unique feature of temples in the early days was that no nails were used in the constructions and the whole place were adorned with carvings, sculptures and intricate columns.
Nearby is the 仙祖宫 Siang Cho Keong Temple. Built in 1869 by the Hokkiens, it is dedicated to the Tua Pek Gong. Nowadays, the temple is more famous for its lucky 4-D numbers. On the first and fifteen of every month, devotees gathered to witness the drawing of a new set of 4-D number which is pasted prominently on the main urn.
There are other Chinese temples nearby but within the confines of Amoy Street, Telok Street and Cecil Street, these are the only 2.