I arrived in Antwerp in the evening and ended up leaving very early in the morning and it rained 90% of my time in the city. I did my normal though after checking into my hostel. I looked at the map and picked a direction. I recommend this as a phase one for any traveler in a new city.
I was not the biggest fan of the city. I found it rather boring. I ate food food at a seafood reasturant (mussles and fries are a must in Belgium). Also I recommend looking at the diamond district if you are interested in jewelery and or architechture.
Europe is amazing for architecture nerds!