The Keukenhof in April and May
Anne Frank House and the Westerkerk
Canal Boat Tour
Canal Bike (if you are up for some exercise)
Bike Tour or just rent a bike (if you are up for some exercise)
Rijksmuseum
Van Gogh Museum
Heineken Experience
Coffeeshop (if you indulge in other than coffee)
Dam Square
Vondel Park
Floating Flower Market
Antique Tram Tour (summer months)
Leisurely lunch or at least coffee and dessert by a canal.
One kilometer long street market on Albert Cuypstraat
Summer concerts in the open air theatre in Vondelpark
Trendy small shops in "The nine streets" ("De negen straatjes")
FEBO - food in the wall. You pay some euro tokens and out comes a great treat. You may not be sure what you are eating (the titles are in Dutch), but it is all delicious.
French Fries with the mildly sweet Mayo.
Museum of S E X - Very entertaining and eductaional, a little humourous too.