Sintra - A day trip for a breath of fresh air Sintra, about 30 km west of Lisbon, is a refreshing place to go for a day trip, especially to relax and renew after the demand’s of a big city. It’s a place to visit for its mountain-top views toward the coast, the Parque Natural de Sintra-Cascais, the funky palace, tranquil convents, and lush gardens.