What are the best museums to visit with 2 days in Amsterdam?
You need to see the Rijksmuseum Amsterdam - It is the Museum of the Netherlands, the most prominent and largest art museum in the country and has a phenomenal collection. Nearby and within walking distance is the Van Gogh Museum which is also absolutely amazing. It shows the artist's work in chronological order so you can see the progession of his style. Both museums can be done in a day if you'd like.
The third is the Anne Frank House. It's not an art museum, but is an important and very well done museum that tells Anne's story. This can get very busy, so I'd suggest buying your tickets in advance or getting there early.