Stroll through Alfama.
Visit Pena Palace.
Explore Boca do Inferno.
Taste Port wine.
Visit Bom Jesus do Monte.
Explore Castle of Guimaraes.
Visit University of Coimbra.
Explore Convent of Christ.
Visit Roman Temple.
Relax on Praia do Camilo.
Explore Ria Formosa.
Visit Quinta da Regaleira.
Experience Belem Tower.
Visit Jeronimos Monastery.
If you have more time, consider staying overnight in Sintra to visit more attractions. If you have less time, consider skipping Faro and Tomar. Remember to check for opening and closing times of all attractions to ensure they are open when you plan to visit.