Why not visit the Rijksmuseum in Schiphol Airport, it's free and located in the passport control area between piers E and F. It's really great and you can see works of art from the Dutch Golden Age.
As an Irish music bar set along the banks of the Amstel river, Mulligans is haven for musicians, songwriters, occasional bathroom singers and hundreds of visitors and tourists. Drink the Guinness :-)
Watch yourself live on the Dam Square Web Cam: http://www.mydestination.com/amsterdam/6177985/dam-square-webcam
