The building seems to be an ode to 'Fondation Beyeler' and the garden is by the great Piet Oudolf. You can walk around the estate even if you don't want to enter the museum. 

Great exhibitions.

Somewhat outside of the city but worth the lil trip 

Since Indonesia was a Dutch colony, there are a lot of Indonesian restaurants in Den Haag. But although small, the absolute best is Dayang, in the Prinsestraat.

There are many Indonesian restaurants in The Hague, but this is one of my favorites. Only 3 tables. Mainly take away food. Also very kind staff.