In front of São Sebastião is the largest of Brazil's islands, Ilhabela (390km2), much frequented by the Paulistas during the school holidays. The coast closest to the mainland is lined with seaside resorts; further inland is the peak of São Sebastião (1 375m) and a largely untouched tropical rainforest (protected by UNESCO). On the other side of the island there are some fabulous beaches. Go diving and explore the shipwrecks, try windsurfing or simply succumb to the pleasures of idleness.