The Oeverpark (a.k.a. Overhoekspark) is a relatively small park, located in Amsterdam North. The park is part of the new development named Overhoeks, at the North shore of the IJ.
It is a perfect place to have a picnic - the grass is soft and you have a wide and beautiful view over the IJ river (plus: you can make use of the bathroom in the EYE Filministituut).