Open air sculpture museum with an impressive collection of sculptures and trees. Entrance to the park is free of charge, but they have a café and a small book shop if you do want to keep your money moving.
Right next to the art academy of Antwerp, this small café is a terrific place to sit down and enjoy the view of people passing by. Their coffee is very good and they also have a variety of ways to prepare it, if you're into that stuff.