Just hop on to any taxi and tell the driver, Huang Sha Seafood Centre!
There, you can select your own seafood, lobster, fish, salmon, oysters, etc.. and you bring them to the restaurants nearby to ask them to cook for you.
Cheap and fresh!
That night, we spent in total about RMB500 for a table of 7 of us..
Weather in GZ seems to be turning cooler these few days.. wear thicker clothes.. take care!