Amsterdamse bos in my opinion is the most beautiful part of Amsterdam area. Huge forest with plenty of walking and biking path. Full of stunning canels and lakes. Sunset by a lake will top up your day.
The pancake house in the middle of the forest (http://www.boerderijmeerzicht.nl/en) is a most go on a sunny day, where you can enjoy Dutch pancakes in the nature. There is also a lot of outdoor activity. It is a popolar camping site in the summer. You can go rowing, walking, cycling, jogging. There is also a climbing park.
If you are going with kids, on Sundays in the summer you can explore the old tram track just by the south part of the forest. The tram track is normally not in operation but on Sundays they run some old wooden tram on it.
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