Hi Sulis,
I live in NL (US expat) and have travelled quite a bit in Western Europe. Belgium is great for some roadriding, but if you mtn bike, the Ardennes in Belgium is spectactular. You'd need to catch a train or drive there though. Antwerp is not a bad city, very eclectic, but not as "charming" as some other European cities. You can also easily visit Netherlands from Belgium, and places like Brugges which are very picturesque. Even a train to Germany is quite easy and quick. And Paris by train from Belgium is about a couple of hours.

Do you want to visit lots of cities, bike, leisure biking or ?

Feel free to PM or email me (my screen name at yahoo.com) if you want more detailed input.

Renee