theres plenty of depravity in the red light district especially by night.
I would heartily recommend The Rokery, there are a couple in the city but my fave is in the south/central disctrict of Leidseplein.Its the most chilled out coffee shop…so if you like that sort of thing you can shmoka da pancake to your hearts content. Go for a hot chocolate too after one of thier finest northern lights..
And try the bar in The American Hotel, also in Leidseplein. I met Ronnie Wood last time I had a drink there.
Rembrandtplein is a great area to bar hop and people watch too.
The best thing about central Dam, is you can walk to pretty much any part of it in 30 mins if you feel like it. Other wise just hop on a tram.