There are many places to go in Portugal if you are looking for nightlife. You can go to the movies, visit modern bars and traditional locals where you can hear Fado, the typical portuguese music, as well as disco´s hwere you can dance to more modern music whether it be african or european.
In general, the main cities in the coast offer more services than in the interior of the country. But all cities and towns have places for tourists that prefer not to stay at home and want to have some fun at night. The nightlife in Portugal is very animate. You have many restaurants, disco´s, bars etc...The choice is yours!