Begin your trip near the monuments in Belém, then catch a Lisbon urban train along the Cascais line to enjoy the magnificent view of the Tagus estuary, the coast and the Estoril beaches. In Cascais, you can continue your trip on the Scotturb buses out to Cabo da Roca, the most westerly point of mainland Europe or up to Sintra. You can organise your own outing if you prefer.
See here the outing sugested by our ambassador Catarina Tagaio.
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CP Services: Lisbon urban trains
You can also get a Museum Neighbourhood + Cascais line ticket that includes the train journey and admission to various museums in and around Cascais.