Lisbon in a nutshell, with just a few days available

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some useful information to visit Lisbon

take a ride on tram n. 28 or 12: you will fall in love with these funny and noisy means of transport, and you will see the oldest and most suggestive districts of Lisbon at the cost of a café.
Try all of the singular means of transport in Lisbon, such as the ascensores and elévador , as well as the modern underground: they are efficient and cheap, and you will save lots of time moving around by public transports .

Greca Igreja da Senhora do Monte, Hotel Lisbona

Spend a few hours at the wonderful Castelo de São Jorge: from its walls the sight of the city is really amazing
Walk around the Bairro, Chiado and Alfama without the use of a map, which would only distract you from the view of the azulejos standing out of the façades.
Go to see the old and modern architectural beauties in Belém
Take a quick visit of the Parque das Naçoes to have a taste of the modern and futurist side of Lisbon

Torre de Belem Lisbona Hotel Lisbona Portogallo

If you have more time available:

Visit the Museum dos Azulejos.
Visit the Oceanário inside the Parque das Naçoes.
in Belém stop at the Antiga Confeitaria de Belém to taste the exquisite Pasteis
make a trip to Cascais, rent a bike and go to Cabo da Roca, the western point of continental Europe
spend a few hours in one of the wonderful parks: Parco de Monsanto, the various botanical gardens, the gardens on the Tejo embankment, or those at the Parque das Naçoes.
Visit at least one of the numerous museums of the city
Make frequent breaks in the numerous cafés of the city: they represent a real institution in Lisbon, just like its monuments.

Baixa Ponte 25 de Avril, Hotel Lisbona. Portogallo