Lisbon in 2-3 days
Not an overly huge city, two or three days is ample time to get a good feel for Lisbon life. Orientate yourself around the steep and winding streets of Lisbon by exploring the different bairros that surround the city centre. Catch a tram up to the Moorish castle for a spectacular view, walk up to the castle ruins with even better views, and wander down through the maze of streets past the Sé Catedral and Alfama, the home of fado where a museum is dedicated to the traditional music, and grab a cheap meal from many of the restaurants. Visit Belém for its famous Pastéis de Belém, and visit one of the many museums. And for late night partying, head to Bairro Alto to boogie the night away in Brazilian salsa bars, or listen to fado music in the many taverns.
In one week
Basing yourself in Lisbon for one week gives you the freedom to explore the inner and outer city districts of this seaside haven. You can take a day to visit Parque das Nacoes, take the gondola for views of the old Expo site, and visit the impressive aquarium. The picturesque town of Sintra should not be missed, but there also many seaside towns south and north of the city that offer beautiful beaches and superb seafood.