The crime rate in Amsterdam is exceptionally low, so having your bike stolen is the worst thing most likely to happen to you. Still, in crowded intersections and dark alleys, it's always best to be streetwise and take double safety precautions; it may be best to keep your money in a money belt and not flaunt your expensive camera. Be especially wary of pickpockets in crowds and while riding the tram. And use common sense when going out at night. Keep to well-lighted areas and take a taxi if you're going to unfamiliar places. Although it's easy to lose yourself in a romantic 18th-century haze taking a midnight stroll along the canals in Amsterdam, remember that muggings do very occasionally occur. Late at night, it may be best to keep to the main thoroughfares and not venture down deserted streets.
Distribute your cash, credit cards, IDs, and other valuables between a deep front pocket, an inside jacket or vest pocket, and a hidden money pouch. Don't reach for the money pouch once you're in public.