Most people get the day off for Presidents' Day. But those who work in New York public schools could be off for the entire week. To fill in the time, a number of places have special extended hours, and some museums normally closed on Monday will be open on Presidents' Day. Note: the Metropolitan Museum of Art is now open Mondays every week, as is the MoMA.
In Queens: The New York Hall of Science at 47-01 111th Street, Queens, NY 11368, has designated this Presidents' Day, February 17,20124 Engineering Day, and the whole week, Engineering Week. with different days designated to various types of engineering, like civil, nano, chemical, and mechanical. All the special programs are included with standard admission.
If you already have membership in a museum that participates in the ASTC program, you should be able to get in free at the Hall of Science, though you may want to double-checks.