Keizerspleintje
Very basic spot, has some kind of a funbox, you can use it as a chill place. Funbox has one side down and a top (duh).
Directions
Get to amsterdam central station, walk down the "Zeedijk" or the "Geldersekade" till u come at the "Nieuwmarkt" (has some kind of castle on it) u will see an entrance to the underground station, its right beside the elevator to get to the underground. ( Entrance to underground has a very long handrail, in case your sick in your head, you could try to grind it )