Maritime Museum:
Visit one of the best maritime museums in the world that tracks the history of portuguese naval domination from the 14th century onward.
Jardim Zoológico: Estrada De Benfiea 158-160 (Metro:Take the Blue Line to the Jardim Zooligico. Buses: A variety of buses stop here including 16, 31, 54, 58, 701 and 755). 10AM - 8PM (21st March - 30th Sept.) and 10AM - 6PM (1st Oct. - 20th March). A zoo that is fairly pricey, but has a variety of exotic animals featuring sea-lions and dolphins. ?15.
Walking tours:
Lisbon is a city that invites a stroll around its unique neighbourhoods notably Chiado, Bairro Alto, Mouraria and Alfama. Turismo de Lisboa publishes self-guided walking tours. Lisbon Walker offers a range of six walking tours, all kicking off from Praça do Comércio.
Bus tours:
Standard bus tours are offered by Cityrama, including Sintra, Cascais and Estoril. Tours depart from Praça Marqués de Pombal, although pick-up can be organised from a number of hotels. Cityline runs an open top hop on hop off bus service. The tour departs from Praça Marqués de Pombal though you can join at other points.
Boat tours:
Transtejo offers a variety of boat tours, including two-hour 30-minute tours of the River Tagus, from the docks east of Praça do Comércio and travelling as far west as the Belém Tower. Tours depart from the Terreiro do Paço river station, April to October. Cityrama operates a three hour cruise on the Tagus. Tours leave from Praça Marqués de Pombal.