Buy your tickets on the internet site of the museum and print them at home. That way you can avoid a lot of queueing. Flowers, plants and seeds you purchased at the Flower Market need to have a stamp on the packet that indicates they have been cleared through customs; this will allow you to cross country borders with your flower packet safe. The Red Light District is a camera-free area. People around here are very sensitive to the sight of a camera. Like most of big cities, in Amsterdam there are pickpockets. Try not to place your bag or wallet behind you. Be more cautious if you are in a crowded area as pickpockets act together to deceive their victims.