LEIDEN. It's a pretty city, 30 minutes by train East of Amsterdam. There is a very famous university.
It is pretty quiet but the nightlife is interesting due to the students. There are many interesting museums but i did not stay long enough to visit any of them..maybe next time...
As an expat living the last 20 years here I would highly recommend visiting Leiden. Fabulous collection of museums (don't miss the mummies at Rijksmuseum van Oudheden). And canals as beautiful as Amsterdam's any day. Great Sat. market.