Guilty by Oliver - Restaurant & Bar
Bairro Alto - Nice views and go to a fado bar (traditional Portuguese music) or you can listen to it in Alfama which is where fado originated from. Also try ginginha, its a liquor shot
Docas de Lisboa - For clubbing, clubs there close around 7am
Cristo Rei - Statue of Christ, its on the other side of the river
These are some of the places I went, you probably wont have time to do all those things but research and go to wherever tickles your fancy.
Also try Pasteis de Belem - Traditional custard tart kinda thing, it bangs
Oh and watch out for them gypsies, dont interact with them too much