After what had become a tour of "look this is where a bunch of Jews died" historical spots all over Europe, it was so refreshing to come to a museum which helped my kids understand that Jews *live*. The Kids' Museum at JHM is second-to-none. My kids prepared challah in the kosher kitchen with a lovely guide and really loved Max the Matzoh, who "led" them around, played in the music room, and worked on Hebrew.
The museum-in-the-shuls is a great concept and the exhibitions for adults are well-curated and interesting.
Portions in the cafe are small but delicious, so plan on just having a snack here.