As above, Red Light District is pretty grim, full of utter dickheads and trafficked women.
As an area Jordaan was probably my favourite. Some brilliant vintage shops (christ I sound like a hipster) and some cracking bars too.
Van Gogh museum was my personal favourite, but Rijksmuseum is great too….at the wrong time of day, queues can awful at both though. 2pm was a good time to go, but you may get kicked out before seeing everything.
Something a bit different is the museum of Bols (maybe it’s called House of Bols?) for me and Mrs B it was about 20 euros (slightly less iirc) and you get the entire museum plus a cocktail of your choice and two shots at the end of the tour. We did it a lunchtime prior to any substantial food and were steaming!!!
One of the best cities that I visited, really relaxed for a major city. Avoid the stag do/bellend areas and you’ll have a cracking time.