A "hop on, hop off" bus tour is an easy way to learn about the city's major landmarks, with the opportunity to get off whenever you like, explore an area, visit a museum, have a meal or snack or bathroom break, and then hop on another bus for more sightseeing. Meanwhile, the novelty of a double-decker bus is a definite kid-pleaser.
Two companies offer these convenient tours -- read more.
See also: More Top Things to Do in New York with Kids.
Photo courtesy of CitySights NY.

One thing that’s really fun about NYC bus tours are the double decker buses. Those alone were enough to keep my nephews entertained touring the city!