I've been to Amsterdam twice. I'm going again in March on a 4 night cruise because my friend works for Carnival and got us a dirt cheap deal. We are actually there on the Sunday night when Holland play Germany in a qualifier, cannot wait for that atmosphere.
Nothing will ever beat my first memory though. Walking into a sex show, seeing two 11/10 blonde girls on stage, a double ended dildo and Sonne by Rammstein playing in the background.
I was mesmerized.