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!
Jenever is a traditional Dutch spirit, sometimes called Dutch gin or wodka in English. Wynand Fockink has a distillery and tasting house right at the very hart of Amsterdam. This place is frequented by locals and tourist alike because of their delicious jenever. Be sure to try a glass of Wynand Fockink Superior. If they empty the bottle while filling your glass you're entitled to a so-called 'Amsterdammertje'; you'll have to drink your glass in one gulp and then you get a free refill.
A theatre hidden in the man made forest on the outskirts of Amsterdam. An impressive setting with impressive shows. Watching an interesting piece under the stars is quite a memorable experience. Further more it's a nice bike ride leading you past rowing waters, fields to play picnic in or a pancake house if you feel like something warm and sweet.