We did not have museums tickets in advance but lucked out with the Rijksmuseum. DW asked at the box office and there were no tickets available at the time, but there were for the next half hour. Before that we went to a smaller museum, Moco, IIRC, near there. Later, we went to the Jewish Quarters and the Portuguese Synagogue. We were told our tickets were also good for the Jewish Museum, so we also went there, but only for a little bit as it was near closing time.