The benefits are clear: the train is a safe, comfortable and ecological means of travel.
See here suggestions for your outings.
CP Services: Lisbon urban trains
You can see the time that is left by swiping your card across a ticket vending machine or at any Lisbon urban ticket office.
€2 - Return journey price on the Lisbon Sintra, Cascais, Azambuja and Sado lines per person.
These tickets are on sale from ticket offices. Large groups (>50 people) and any groups that need assistance, should complete the booking form. Bookings should be made with at least 3-days notice.
Here are just a few suggestions about where you could go: