☆.A.
The zoo is nice! A little expensive, but most zoos are, right?
Check out the Carnegie Science Center & Sports Works (www.carnegiesciencecenter.org) or the Children's Museum (www.pittsburghkids.org) Both on the NorthShore.
You might like Station Square (www.stationsquare.com) and a ride to the top of Mount Washington on the Monongahela Incline (www.portauthority.org/paac/RiderServices/Inclines.aspx). Take your camera!
Kennywood is nice as well if you're in the mood for an amusement park. www.kennywood.com