Answers:

lanenalaura
Geneva

Hi! I would recommend you Lisbon of course. I love this city, there are so many things to see there. 3 days in Lisbon is great. Then it really depends what you are looking for… In I didn’t like Porto, but Braga is wonderful. In the center/south, I will recommend you Obidos, Tomar, Evora…
I have many pictures on flickr, have a look there: www.flickr.com/photos/lanenalaura

joaoa
Portimão

Visit the Algarve, too. Especally Silves, its castle and Alvor, a small fishing village. If you like a nice beach coast, this is definitely a place to visit. Don’t forget Lagos and Sagres, the farthest western point in Europe.