Great tips! Allow me to add two warnings.

Anarchists: the Netherlands are a monarchy. Do not make jokes about the king! Lèse majesté is a crime there. Monarchists love their king. Having in front of you a young dreadlocked neo-hippie with anarchy patches stitched all over his self-crocheted pullover and bogarting a blunt is no guarantee you are not talking to a monarchist. If in doubt, everyone in the Netherlands is a monarchist. Praise the king!

Do not drink alcohol in public! Unless that beer is worth 40€ to you. The same goes for pot.