Here's what Trippy members say about Baía de Cascais:
"Lisbon should take one day. Sintra should take one day (maybe exhausting). Cascais should take less. If you'd like more advice please inform the area where you're staying (for public transportation details), food preference, night style preference, any special interests, etc. Lisboa Belém Depending on where you're staying get tram car number 15 from Praça da Figueira to Mosteiro dos Jerónimos and go to the tourist office (small one in the corner of Praça do Império). Visit Belém area. Next to the tourist office: - Mosteiro dos Jerónimos Three gardens next to each other (from west to east): - Praça do Império - Jardim Vasco da Gama - Jardim Afonso de Albuquerque By the Tejo river (you have to cross the railway in a pedestrian tunnel next to Padrão dos Descobrimentos): - Padrão dos Descobrimentos - Torre de Belém Downtown One hour walk: - Terreiro do Paço (Praça do Comércio) - PRAÇA DO COMÉRCIO - Baixa (downtown) - Praça da Figueira - Rossio - Praça dos Restauradores - Avenida da Liberdade - Parque Eduardo VII - Praça Duque de Saldanha (three shopping centers for convenience) Castelo de São Jorge: from downtown "climb" to Castelo de São Jorge through Alfama during the day (maybe lunch). Bairro Alto: from downtown "climb" to Bairro Alto through Chiado during the evening/night (maybe dinner and/or drinks). Parque das Nações (optional) Take the subway, Red Line to Oriente. Take a walk by the river both in south and north directions. There are plenty of gardens, restaurants and bars there. Alternatively you can ride the cable car with a panoramic view. Sintra Depending on where you're staying catch the train from Sintra line which begins in Restauradores and go to the end of the line (Sintra). It's better to come back to Lisbon for dinner or maybe get a taxi after dinner. The train _may_ not be the safest choice during the night. Go to the tourist office. Just ask for "turismo", locals will hopefully show you the way. There's much to see/visit (check )." See More