I just mentioned Blake Pier in the last post after checking a 1990 map (close enough, even for somewhere as rapidly changing as HK) and can confirm that it was also used in the following scene when the two US cops are eating some food with the Central Vehicular ferry pier in the background.
The last generation of Blake Pier (the original one can now be found over in Stanley) was a dog-legged affair that zig-zagged out from the Central waterfront almost slap bang in the middle of where the Star Ferry and Vehicular Ferry piers were located. Judging from the screen grabs below I would say that the actors were eating at the far end of the pier along the portion of the pier that ran parallel with the waterfront.
I'm sure some of the HK locals that read this blog will be able to confirm that there was a restaurant at the end of the pier. Anyway, in case you are curious about the shape, you can see the pier (being constructed, bottom right) in this postcard image over on Gwulo.com.