Not to be confused with its American counterpart with only one “a” and where you are much more likely to get mugged, the Dutch Haarlem is about 15 minutes by train and an hour by bicycle from Amsterdam. I know this because I happened to do both in one direction each this past weekend- not a bad day out!
Haarlem is great. I lived there for the first five years of my life in Holland. It’s one of the best places I have lived.