The Oostvaardersdijk is huge dike that protect the polder of Flevoland from being flooded. It's near the city of Almere that was founded in 1975 on the just recovered land of the Flevopolder. It is a great place to see the skyline of Amsterdam and look out over the Markermeer, the former Zuiderzee. When you turn around you can look down in the polder on an impressive group of modern windmills, in the distance you see the city of Almere. This is Holland at it's core: endless flats with the endless skies you know from Seventeenth century painting. You can drive the Oostvaardersdijk north to Lelystad and cross the lake to Enkhuizen and back to Amsterdam. On the way you drive past Oostvaardersplassen nature reserve, a large area of marshes and wild land in the Flevopolder, where they introduced wild horses and prehistoric cattle.
Hidden in the greenery near Westerpark, the perfect hideaway from street noise can be found if you know where to look: a little farm called "De Buurtboerderij". Surrounded by a bunch of sheep and a happily decorated garden, the restaurant inside serves one fixed menu a week for a low price. The farm serves as community center as well and is run by volunteers — and you when you eat there! — and there are plenty of sweet people and animals to hang out with.
It is in the city centre. This former navy area is now partly open for the public. In summer you can swim in the canal there and have a great view on old Amsterdam, the Scheepvaartmuseum and the dead heart centre of Amsterdam. I like it most in winter, silent, grey, a place to mesmorize, walk alone around, meet a local who is walking his dog, than and have a coffee in pension Homeland, the restaurant hotel there. In central Amsterdam the space is rare, and what is there is overrun with tourists and full of local traffic, the trams, a million bikes, cars and pedestrians. That is why I like this place so much, super quiet space in the centre of Amsterdam.