De Wallen (Red Light District, Amsterdam)

The Red Light District is located slightly northwest of Amsterdam Central Station, between Nieuwmarkt (New Market) and De Oude Kerk (Old Church). The center is located at the Achterburgwal, there are numerous shops where there is nothing that is not available. Between the Achterburgwal and the Nieuwmarkt, the alleys, some of which are very narrow, meander, in which the ladies lounge behind glowing red windows and thus create a unique image of a red-light district worldwide. On Saturday evenings from spring to autumn, thousands of tourists and locals push their way through the narrow streets

Rotlichviertel Amsterdam's busiest from about 23 clock

You should also look at this when you are in Amsterdam.