Rua Agusta in the City Center. From here you can visit all the City Center in a walking distance. This street has plenty good restaurants and typical souvenrirs stores.
Bica, a very nice place to be during the day for it's view, and at night for it's several typical bars and restaurants.
Inside the Belém Tower, looking to the sea
The colors of Alfama
São Pedro de Alcântara belvedere. From here you can get an amazing view of the entire city. This belvedere is quite near to Bairro Alto, an old neighborhood full of restaurants and bars
"A Brasileira" - One of the symbols of Lisbon. In the 19th Century this Cafe was visited by well known writers. At the entrance you can see a statue of Fernando Pessoa, one of the most important Portuguese intelectual personalities.