@Stace126: I *might* have just researched all of this and put it onto my website last night:
Museum of Modern Art
A large, modern art museum.
Location:11 West 53 Street New York, NY 10019, click here for directions
Admissions Information: Free on Fridays from 4:00-8:00pm. Discounted admission available for groups of ten or more people when you schedule a group reservation. Adults: $25, Seniors (65 and older with ID): $18, Students (full time with current ID): $14, Children (16 and under): Free
Metropolitan Museum of Art
A large art museum which contains art ranging from ancient to modern times from all over the world.
Location: 1000 Fifth Avenue (82nd Street) New York, NY 10028, click here for directions
Admissions Information: Reccomended donation, Adults: $25, Seniors (65 and older): $17, Students: $12, Children under 12 (accompanied by an adult): Free
A museum known for its architect, Frank Llyod Wright, the Guggenheim collects art from the mid-19th century to the present from around the world.
Location: 1071 5th Avenue (at 89th Street) New York, NY 10128, click here for directions
Admissions Information: Discounted admission available for groups of ten or more people when you schedule at least two weeks in advance through the sales office (212-423-3774). Adults $18, Seniors $12, Students (with ID) $12, Children $5
The Frick Museum
The Frick Collection includes some of the best-known paintings by the greatest European artists, major works of scupture, eightneenth century French furniture and porcelains, Limoges enamels, Oriental rugs, and other works. The museum building itself is a neoclassical mansion designed by Thomas Hastings for Henry Clay Frick in 1912.
Location: 1 East 70th Street New York, NY 10021, click here for directions
Admissions Information: Adults: $18, Seniors: $15, Students: $10. Children under 10 are not admitted.
New York Aquarium
A large aquarium. Everyone likes fish, they don’t bite.
Location: Surf Avenue & West 8th Dreet in Brooklyn, New York 11224, click here for directions
Admissions Information: Adult: $14.95, Seniors (65+): $11.95, Children (3-12): $10.95. Additional tickets required for 4D theatre. Parking is $13.00. Fridays after 3:00pm admission is by pay-what-you-wish-donation.
They aren’t free, but you can spend all day at most of these places. ETA: There is also the Bronx Zoo, Central Park Zoo, Prospect Park Zoo, and Queens Zoo. My wedding is in NJ so the rest of the stuff I listed is in NJ. Of the museums my favorite is probably the Frick followed by the Met. I like art a lot, which is why there are more museums listed than anything else.