The Best Transport is a 72 hour tram pass around 13 Euros, A visit to the Heiniken Brewery is a must as you get Three beers and some surprises.
The Amsterdam Dungeons is a good visit also Madam Tussauds waxworks on the Dam Sq.
Red light district is good for a walk around but don't wander alone down dark alleys but there is plenty of poeple around also I would not bother with the sex museum as it is a waste of money. Plenty of fast food resturants everywhere and great cheap resurants around the Leidseplein try the Sports bar next to The Bulldog for great Spare ribs or Pancakes. Have a great Time.