I'll second Bicyclemark's recent warning re: Amsterdam fireworks on New Years Eve. Other than a helmet, however, I'd recommend staying completely off the streets. Instead, find a fun house party, and observe the colorful war from a safe vantage point.

The fireworks begin days before the actual event, and continue for several days into the New Year. It could probably scare the unsuspecting visitor quite badly, but have no fear: It's all in good fun.

The experience is unforgettable, I'd agree. But better to come out of it with all limbs intact.