We so enjoyed previous visits to the lizards and snakes at the Museum of Science that we went back today. Earlier in the day, (a different) we were in Canto 6 at the same time as Mayor Menino.
Canto 6 would get my vote for best (plain) croissant in Boston. Flour didn’t have any on my most recent visit (and it’s not the first time I’ve caught them with their croissants down), and so lost the “final” by default. But others have done far more extensive research than I have.