Long before the island acquired its current name, the largest landmass in the archipelago was called Maembipe by Native Brazilians, who used it as a site for trade and prisoner exchange. The Portuguese arrived in 1502, and settlement began shortly after, though the official founding of the village did not come until 1806, when it was christened Vila Bela da Princesa -- 'Beautiful Village of the Princess.' The municipality was renamed Ilhabela in 1945, and in 1977, the majority of the archipelago's area was declared a state park, later recognized as a UNESCO Biosphere Reserve. That designation protects nearly 85 percent of the island, ensuring that the rainforest canopy that blankets its mountainous interior remains largely as it was when the first traders paddled across the channel.

Ilhabela's geography splits the island into halves that feel like different countries. The western coast, facing the mainland, is where most of the population lives. A single main avenue threads along the shoreline, connecting small towns, restaurants, and marinas. Beaches here tend to be calm, sheltered by the channel, and suitable for sailing and kayaking. The eastern coast is another story entirely. Facing the open Atlantic, it is rugged, wave-battered, and largely deserted. Castelhanos beach, on the southeast side, requires either a boat or a drive along an unpaved road that operates on a one-way schedule -- eastbound in the morning, westbound in the afternoon, controlled by park rangers at the entrance. Bonete, voted one of the top beaches in the world by The Guardian in 2015, demands a 12-kilometer hike through the jungle or a boat ride to reach.

Ilhabela does not pretend to be a resort. The island's rainforest is home to the borrachudos, a biting sand fly whose attack leaves an itch that can last for days. Locals and guidebooks alike warn visitors to apply repellent constantly, even to the soles of their feet. Pollution from the mainland occasionally fouls the western beaches, and the state environmental agency monitors water quality weekly, posting red flags when swimming is inadvisable. These are not flaws in the destination so much as reminders that Ilhabela is a genuinely wild place operating on ecological terms, not tourist ones. The trails through the interior offer trekking and mountain biking through terrain that ranges from steep coastal slopes to the summit of Pico do Baepi, where the forest thins enough to offer panoramic views of the archipelago.

Getting around Ilhabela requires patience. Municipal buses run the length of the western coast for a few reais, but beyond the paved road, the island belongs to hikers and boaters. The interior is laced with trails that connect waterfalls, hidden coves, and backcountry camping sites on the eastern shore. Cell service fades quickly once you leave the main towns, and some bus stations offer free Wi-Fi as if it were a luxury amenity. The pace is deliberate, shaped by ferry schedules and tide charts rather than clocks. Nearby on the mainland, the colonial town of Paraty lies 150 kilometers to the northeast, a fully preserved 18th-century port town once used as a hideout by pirates. Ubatuba, 80 kilometers up the coast, offers some of the best surfing and diving in Sao Paulo state. But Ilhabela's particular gift is the sense that the modern world sits just across a narrow channel, close enough to see but far enough to forget.