Kids at Art: The most creative, fun, and personalized birthday parties are at Kids at Art, where there are a variety of art projects to choose from in a private art studio, which is all yours for an hour and a half. Projects can be tailor-made for your child, or you can choose from a variety of others. kidsatartnyc.com
McBurney YMCA: Book a Saturday or Sunday birthday party room at McBurney YMCA for up to 20 guests. One package for 16 guests offers a one-hour activity such as gym sports, swimming, crafts, face painting, or playing in the indoor playground. ymcanyc.org