Central Park Zoo is small but perfect for young kids (under 8). You can see everything in 2 hours easily, though the Children's Museum of Manhattan nearby can extend your day if kids want more activities. Zoo is right in Central Park, great playground next door at 65th Street.

Bronx Zoo is massive with more animals but full day commitment and harder to reach. Take 6 train to East 180th, walk 10 minutes. Admission $40 adults, $30 kids.

For families staying Manhattan, Central Park Zoo more manageable. Save Bronx Zoo when you have dedicated day and older kids who can handle walking.