if you have 3 days
If you’re visiting Lisbon, you must have a little interest in history, because the city is full of historical landmarks. Start with the Baixa district. While there in the morning, check out the Praça do Comércio, the former royal square, and the Rua Augusta arch. If you’re up for more walking in the afternoon, check out the Alfama district, the oldest part of Lisbon. Wander the narrow streets and alleyways, and visit the São Jorge Castle. You have to sample some of the local food in Alfama.
When it comes to landmarks, you can’t skip the Belem district on the second day. It’s home to some of Lisbon’s most famous landmarks. See the Jerónimos Monastery, the Belém Tower, and the Padrão dos Descobrimentos. Take a break from walking in the afternoon by enjoying a boat trip on the Tagus River – you can catch views of the city this way.
Maybe it’s time to visit something new on the third day -Visit the PrÃncipe Real district, a trendy and up-and-coming area. See the PrÃncipe Real Garden and the LX Factory, a former industrial complex that has been transformed into a creative hub. In the afternoon, visit the Parque das Nações district, built for the 1998 World Expo. See the Oceanário de Lisboa, one of the largest aquariums in Europe. Finally, close the day out with some fine portuguese dining.
The best time to visit Lisbon is during the spring (April-June) or fall (September-October) when the weather is mild and there are fewer tourists.
if you have a week
If you have a few additional days, i would highly recommend Sintra. See the Pena Palace, Quinta da Regaleira, and the National Palace of Sintra. I would suggest packing a picnic lunch that you can eat among the mountain scenery. Other than this, check out the nightlife in the Bairro Alto district, Lisbon’s nightlife hub.