Explore Berlenga Grande on this day trip from Lisbon including Peniche village, St John the Baptist Fort, and a cave excursion in a glass-bottom boat.

Drive to the fishing village of Peniche and board a boat for the 45-minute crossing to Berlenga Grande, a postcard-perfect island characterized by secluded caverns and twisting rock formations. After your boat drops anchor at the tiny island’s port, you’ll enjoy some free time to pick up refreshments or stretch your legs with a stroll on the beach.

Next, you'll board a smaller boat destined for St John the Baptist Fort, a 17th-century fortress built from the ruins of an old monastery. Explore the stronghold with your guide and hear fascinating stories of invasions and pirate sieges. Then, uncover the island’s flora and fauna with a 1-hour walk through the Berlengas Nature Reserve.

Back at port, break for lunch at one of the seafront eateries (own expense) or, if you've brought food with you, have a picnic on the beach.

After lunch, you'll join a cave excursion in a glass-bottom boat before heading back to Lisbon.