Madrid may suffer the stresses and strains of a bustling metropolis, but it is in fact a very good destination for families with children. In the Casa del Campo parkland beside the city there's the zoo and Parque de Atracciones, while nearby amenities include the Faunia ecocenter and Warner's Movie World.
Suites are sometimes available, which saves considerably on having to pay for two doubles rooms.
For some general tips on family travel, check our very own Frommer's 500 Places to Take Your Kids Before They Grow Up, which can be purchased via Frommers.com or www.amazon.com.
Note that children traveling to Spain with companions other than their own parents should have a notarized letter from their parents to this effect. For full entry requirements to Spain, check the www. travel.state.gov website.