It is located in the small town of Lisse, south of Haarlem and southwest of Amsterdam. It is accessible by bus from the train stations of Haarlem, Leiden and Schipol. It is located in an area called the "Dune and Bulb Region". In full bloom on a sunny day Keukenhof is quite breathtaking, the colours and variety of tulips make for some beautiful photos, some of which you'll find below.
Keukenhof is open annually from the last week in March to mid-May. The best time to view the tulips is around mid-April, depending on the weather. If you plan to visit the Netherlands try and make it around this time of year and make sure you visit Keukenhof.
Sally & Phil's visit May 2010
Susy's Mum's visit April 2011