summary - head to the latin (old?) quarter for a good, cheap night out, and the port museum for cigars.
the name is "Bairro Alto"
free translation: "High Quarter"
it´s a bit like "red district" in another cities,but full of animation at night
about "Bife na Pedra" or "Steak on a Stone"
( only if you are a woman)

http://odiariodapinkinha.blogs.sapo.pt/351228.html