<p>There are several art museums in NYC, but I'm going to assume you mean the Met, since it's the biggest and most child friendly.</p>
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<p>I recommend starting with the Egyptian wing. I would ten cut through the American wing, where you can get a bite to eat, on your way to Arms and Armour (knights on horses.) After that the musical instruments are great. If you still up for more, then I would go for a change of pace and head across to the modern wing.</p>
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<p>They have family maps at the information desk. You can come and go all day long if you wish, so you might want to take a break mid-day and spend time in the park. For a good meal (and less expensive than museum cafeteria) there is a cafe called Nectar on Madison between 81st and 82nd (out the main entrance of the Met and go straight 1 block and turn right, you can't miss it.) The museum is open late fridays and saturdays.</p>
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<p>The admission is a suggested donation, so if you can't afford the full amount, you can give what you can afford.</p>