Lisbon metropolitan area is the biggest metropolitan area in Portugal and is composed by the folowing local goverments(include cities and towns), Alcochete, Almada, Amadora, Barreiro, Cacais, Lisboa, Loures, Mafra, Moita, Montijo, Odivelas, Oeiras, Palmela, Seixal, Sesimbra, Setúbal, Sintra, Vila Franca de Xira.
I am 100% from this metropolitan area, i was born and i work in Lisbon, live in Almada and my roots are from Sesimbra. So i am a true metropolitan guy.
The metropolitan area can be also divided in 2, the south and north, being separated by tagus river and then you can also distinguiche between the more rural areas and the urban areas.
Cascais is located in the west of Lisbon and is knowned has one of the most rich area. This fame comes mainly because it's here that you can find some of the most richest neighbourhoods and big houses. It's also in Cascais that there is the biggest comunitie of E.U.15 imigrants in Lisbon.
Cascais is a good place to go a for a walk, you have here the most western point in europe(cabo da roca), you have part of Sintra-Cascais natural park, some beaches and the most known casino in Portugal, the Estoril Casino.
So some weekends ago i took the train and i went there and visited the public garden and city hall