Unfortunately it’s not in Amsterdam but De Pont, museum of contemporary art is worth the 1,5 hour trip with the train. The building itself is beautiful, it’s a former wool mill but also there collection is worth seeing!
A really lovely restaurant with terasse with lots of sun hidden in the west and close to Erasmus Park. It is a place where you will a lot of locals catching up. The food is always great and there is a super cosy and friendly atmosphere. The kind of place you actually want to keep a secret so don't tell anyone! ;)