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Take a taxi-bike from Leidseplein and take a trip through the city - agree on the price first.
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http://damtours.nl/noord-holland/amsterdam/product-overview/en Some alternative places - some are not for the whole family...
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Farmer's Golf - http://damtours.nl/noord-holland/volendam/product/Farmers-golf/en
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Visiting some Dutch markets could be fun:
- Jaarmarkt - http://www.cvah.nl/pagina/22/
- or Nieuwmarkt - in here: http://www.cvah.nl/marktenzoeker/provincie/8/
The time I was there alone I just sat at Damrak and watched the other people...