Although I went to lisbon for work, I had enough time to get a taste of Portugal. I loved it.
The tourist sites in the city are all within walking distance. The hills are a workout.
Visit Belem. Especially the famous Pasteis de Belem for the egg tarts.
Be sure to enjoy DOCAS right by the bridge - lots of great restuarants and bars/clubs at night.
I'd like to go back in the summer to go to the beaches.....