Visit Portugal's 'Wild Kingdom'

The Jardim Zoologico de Isboa (Zoological Garden) is both a romantic and playful place with a collection of some 2,000 animals to view while you stroll or from small trams and rowboats. It occupies a flower-filled setting on 65 acres within the Park of Laranjeiras. It's about a 10-minute subway ride from the Rossio.

Tickets are about $11 for adults and children 3-8 are $8.40.

Acquire Your Sea Legs at Aquario Vasco da Gama

Children of all ages will be mesmerized by aquatic wonders at Portugal's Vasco da Gama Aquarium near Alges on the Cascais railway. Live exhibits include the eared seals pavilion and a vast number of tanks that show off fish and other sea creatures from all over the world. Exhibits include preserved marine invertebrates, water birds, fish, mammals, and even some of King Carlos I laboratory equipment.

Children under seven are free and adult tickets are under $3.

The Show is Astronomical at Planetario Calouste Gulbenkian

The Calouste Gulbenkian Planetarium is an annex of Portugal's Maritime Museum. It features astronomical shows on Wednesday and Thursdays year round several times per day. On Sunday at 11 a.m. there is a special session for children over six years of age. Each show lasts 50 minutes. Sunday shows are free and tickets for other shows are under $3 for adults.