I spent 36 hours in Amsterdam back in 1999, but they were pretty memorable. Got there at 6 am one morning, immediately went to a coffee shop and got yoked, walked around, went to Van Gogh Museum and Anne Frank's, went and got even stronger, walked around, met some friends for dinner, got so strong that I was hallucinating, yacked into a canal and then me and two friends found ourselves at what was billed as the largest rave in the world around midnight. There were like 200k people there in this massive warehouse complex and lots of weird shit happened. We met back up around noon to leave (I hadn't see either of my friends in maybe 6 or 7 hours) and I went to the train station and hopped on various trains with my eurail pass and just slept until having to meet up with the larger group in Den Haag later that night. Wife and I had plans to go a few years ago but her dad died right before we were supposed to leave and so we cancelled and never made it over there.