Getting around by public transport
Travelling by train.
Lisbon has a network of suburban train services running to the outskirts of the city and the surrounding towns. Few trains run to the tourist centre of town, so unless you are heading out of the city proper it is not really worth looking at these trains - metro and tram routes are quicker
Travelling by metro.
Metro Lisboa run an efficent modern network of three underground lines through Lisbon. As of January 2006 the fare for a single journey is 70 cents (1 euro if the journey is to a few stops on the outskirts). A 1.30 euro return ticket is available if you will be coming back. The carnet tickets, valid for 10 trips, are not much cheaper than single tickets so they are probably not worth the risk of having tickets left over. Buy tickets from the machines rather than the counter - the instructions are in English so you should be able to find the correct option easily enough.