Shanghai Huang Pu Park (黄埔公园) is one of the famous hangout spot at the Bund (外滩). Apart from the great view of Pudong (浦东) from Puxi (浦西) side, you can also have a great view of the Monument to the People’s Heroes (人民英雄纪念碑) & Waibaidu Bridge (外摆渡桥). I don’t quite like the huge crowd there but still the view of the Bund is absolutely magnificent.
For more information: http://en.wikipedia.org/wiki/Huangpu_Park