Lucas ... are you from Lisbon?

we set to go to lisbon for a week in December. Have bought the Portugal guidebook. Now i have a question ... can you recommend places MUST GO and MUST VISIT plus things MUST Do in Lisbon pls?

we will be staying in Sana Reno near Edward VIIth park ... can u give us some tips pls? Anything ... :D Both of us never been to Portugal so it would be nice if you can give us some pointer as a local.