If you don&;t go to Guang Zhouta, don&;t go to Guang Zhouta. You can&;t see anything up close.
You should go to Haixinsha, opposite Guang Zhouta, to see Guang Zhouta. Haixinsha has the best view of Guang Zhouta, and it&;s free.
Take the subway to Zhujiang New Town Station, walk past Haixinsha, or take APM to Haixinsha and get off.