Lisbon is a beautiful city with plenty to see and do. With three days, you can explore the main tourist attractions, experience the vibrant nightlife, sample some delicious foods, and create wonderful memories of this amazing city. Here are some suggestions based on the search results:

Day 1:

• Visit the Baixa district in the morning.
• Explore the Alfama district in the afternoon.
• End the day with dinner at the LX Factory, a former industrial complex thats now home to quirky shops and unique restaurants.

Day 2:

• Spend the majority of the day in the Belem district, visiting the Belem Tower, Jeronimos Monastery, and the Monument to the Discoveries.
• In the afternoon, visit the Lx Factory and the Alcantara district, or take a ride on the 28 tram.

Day 3:

• Visit the Bairro Alto and Principe Real districts in the morning, and walk along Avenida da Liberdade.
• In the afternoon, visit the Parque das Nacoes district.
• End the day with dinner in the Bairro Alto or Cais do Sodre districts.

If you have an additional day, consider taking a day trip to Sintra to see the palaces, villas, and gardens in the mountainous town. Other suggestions for things to do in Lisbon include visiting the Castelo de S. Jorge, Lisbon Cathedral, Monastery of São Vicente, National Tile Museum, Naval Museum, or the Museum of Architecture and Technology. Dont forget to try the classic Portuguese pastries, sip on local wine, and listen to traditional Fado music.