Lisbon recommendations please

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Am going to lisbon for a long weekend with 5 friends, none of us have been before. Would be grateful if anyone has recommendations of restaurants / things to do.
Thanks!

Also looking for recommendations for Lisbon.
Romantic long weekend planned for wedding anniversary in November looking for hotel and sightseeing ideas.
My idea of a perfect weekend is focused on eating and drinking with a short walk between restaurants, markets, and bars.

This website has a comprehensive list of must sees. I would definitely recommend the castle and Belem. The old town (or Alfama) is wonderfully atmospheric and we had the best lunch ever of freshly grilled sardines, bread and salad in a little restaurant in the Alfama.

I loved everything about Lisbon - the sights, the food and the wine. The people were also very friendly.