Taberna da Rua das Flores: Old school environment, Contemporary and traditional menu, no reservations.
Ramiro: Favorite seafood restaurant in Lisbon, must visit. Be ready to wait in line.
Alma: We are biased on this one since the Chef is our friend. We had one of the delicious tasting menu's and for the price you pay it's a steal. Gorgeous space.
Cevicharia: Have a pisco sour to start and order any ceviche on the menu.
Ze dos Cornos: Super traditional food and environment.
Bairro do Avillez: The space is beautiful and the food is good. Resembles an old market. Cured meats are on point.
Pasteis de Belem: Cliche but worth having at least two. Wonder around after eating the pastries for some sightseeing, there is a beautiful monastery a minute away.
Castelo de Sao Jorge: A really good view of the city
Sintra: A day trip. Take a taxi.
A boat ride over the Douro Valley
Drink Port at one of the wineries in Gaia and enjoy the view of Porto
Have "Tripas a moda do Porto", the regional dish of the city.