It is a big crime :) to stay a friday night at home in Genoa.. Instead you should be leading to Piazza delle Erbe and start strolling around the narrow streets..
Piazza Erbe is just below the Piazza de Ferrari, which is the main square in Genoa. Just take to road to the sea side and follow the narrow roads.. Soon you will be Piazza delle Erba.. Its a small square with tables around, 4-5 bars and people are all out for fun..
Besides the square, all roads leading to or following piazza delle erbe has lots of bars.. And if you are there on a friday night, it is packed with locals.. You may not even walk outside.. Recently smoking inside the bars and restaurants has been banned in Genoa, so people are always taking their drinks and staying outside the bar..