Warsaw does a good job of entertaining children of all ages. The city's tourist information offices offer a colourful, fold-out Free Map for Young Travellers aimed primarily at teens and students, but with some hints for younger travellers as well. For more ideas, see Kids in the City (http://kidsinthecity.pl).
Warsaw's top museum for kids of all ages is the wonderful Copernicus Science Centre, which also includes a Planetarium; note the museum can get very busy on weekends and school holidays. Older children might enjoy the visual and sound effects of the highly interactive Warsaw Rising Museum, though parental guidance is recommended in explaining its dark story. POLIN Museum of the History of Polish Jew has a dedicated children's section.
Parks abound. Łazienki Park has plenty of space to run, plus peacocks to spot, hungry ducks to feed and a boat trip to take. The Saxon Garden and Krasiński Garden both have good playgrounds. There are plenty of outdoor enclosures to explore at Warsaw Zoological Gardens.
In warmer months there's beaches and strolling and cycling boulevards along the Vistula as well as boat trips across and along the river.The illuminated Multimedia Fountain Park is fun and every winter Wilanów Park puts on an illumination show at the weekend.
Palace of Science & Culture
The view from the observation tower of the Palace of Culture & Science is impressive for all ages and just the start of many offerings here aimed at entertaining kids and families. The vast complex includes a youth club section, a dollhouse museum, a natural history museum, a metal sculpture gallery and a puppet theatre.
Need a few more ideas? Filharmonia Narodowa puts on regular concerts for children. At the retro-cool Fotoplastikon you can view 3D photos on a vintage device. All the family can join in painting designs on pottery at Galeria Bolesławiec & Studio Ceramiki. Great eye candy for all ages are the illuminated signage in and around the Neon Museum. There's flashing lights and a chance to perfect your classic arcade game skills at Pinball Station.