Nailit, A pretty city and so much to see. Others have said quite a lot so I'll say something else. Although I don’t know if it will interest your friend, the synagogue might be of interest to you, as might the holocaust museum – nowhere near rivalling Yad Vashem of course, or several others, but if you're not too limited for time well worth a visit. And then there are the streets where you can find brass plaques along the banks of the canals inscribed with the names of Dutch Jews who, in the 1940s, lived in the houses there before falling victim to the Nazis.
Rembrandtplein – Rembrandt Square - so lively with all its bars and restaurants surrounding a central fabulous work of art replicating Rembrandt’s ‘The Night Watch’.
And despite your dismissal, you have to see the Red Light District - you really do - just a little wander. Everyone does. It’s all part of Amsterdam. Enjoy!! :o)
PS. The Amsterdamers .... (is that one 'm' or two? Never mind) ....do a mean apple strudel. ;o)