Sorry I'll just type in English. Don't have chinese input now. (I had to copy and paste the chinese characters earlier).
Pier 16 is for tourists. Peking ship is docked there, but was retired in 1975. It's now more like a maritime museum. You can go for a date there. :)
Pier 11 is for commuters. When I said "I'll buy you a piece of Napoleon cake then walk you down to Pier 11", I was implying that I would send you off without a date. (有点不厚道) . Simply a joke. Don't take it seriously. :)
Hope 简mm get it now. :)