Back to my post of the other day about The American Museum of Natural History... I now know why they call the book, "Dinosaurs in the Attic."
All the dinosaur bones are on the 4th (top) floor. Naturally we worked our way up there and saw them last. Bad idea.
This, apparently is what everyone does because by the time we got there around 3PM - it was packed.
If you visit the museum (and I do recommend it) visit the 4th floor first!