Tua Pek Kong Temple is Sibu's oldest Chinese temple and the most graceful building in the old centre. Its tiled roofs, carved details, and seven-storey pagoda stand close to the Rajang, which is exactly where a protective river-town temple ought to be.
Climb the pagoda if it is open; the view over the river, wharf, and low town is the best quick orientation in Sibu. The temple is active, so visit respectfully and give worshippers room.