While there are a ton of family-friendly NYC boat tours, there are, surprisingly, only a handful of companies that have cruises that cater specifically to kids. Both the Circle Line, which launched its Kids' Cruise series in 2012, and Kiddie Cruises offer regularly scheduled seasonal boat trips in New York Harbor that feature kids' entertainment and activities in addition to stunning views. And a few other companies offer boats for charter, in case you're in the market for a private party on the high seas (a.k.a. the Hudson River).
The pay-per-kid party packages include all of the usual fun like face painting, live music and magicians, plus a couple of extra bells and whistles. All you need to do is book in advance, climb the gangplank with your crew and bring along a cake.