Hi Peter,
I have been over to terneuzen/antwerp for the past four years and am visiting again in September.
We usually stay in Terneuzen which is approx 30mins from the port of antwerp, and is superb for ship spotting as all ships entering or leaving antwerp pass by, have a look at pics from henk as these are taken in terneuzen.
We have stayed at the hampshire hotel and the facilities are superb and they are very accomidating to shipspotters! the bar/resturant also right on the banks of the scheldt so all my meals are disturbed by shooting outside to catch something passing!
web address below:
http://www.hampshirehotels.nl/?p=117&l=nlAlso in Terneuzen is the west kant cafe absolutely faboulous as it has a 360degree view of the scheldt and also has a screen with ship plotter in the bar! the food is alsosuperb.
http://www.westkant.nl/The harbour trips in Antwerp are great and we usualy take a 6 hour one so make sure yr camera batteries are fully charged!
They cover all of the port inc the big MSC home terminal.
these are run by Flandria line there web address is:
http://www.flandriaboat.com/Hope this info has helped a little, feel free to ask me anything else & i will try to help.
Best rgds
Andrew