The 32-kilometer crossing from Paraty's colonial harbor to Vila do Abraão takes between 45 and 90 minutes depending on vessel type, tide, and the number of intermediate stops along Ilha Grande's western shore. No bridge or causeway connects the mainland to the island. Every visitor, whether bound for Abraão's waterfront guesthouses or the trailheads that thread deeper into the Atlantic Forest, arrives by boat. The route threads through the channel between the Serra da Bocaina range and the island's mountainous spine, a corridor that has served as the primary link between Paraty and Ilha Grande since the 18th century when both settlements anchored Portugal's gold-trade network. Today the boat transfer from Paraty to Ilha Grande operates year-round with scheduled morning departures from Cais de Paraty, the stone pier at the edge of the old town's grid. Shared speedboat shuttles and slower schooner-style lanchas leave between 08:30 and 12:30, timed to meet the arrival window when most operators guarantee seats without requiring advance reservations. The speedboats, typically 12- to 20-passenger fibreglass hulls with twin outboards, complete the crossing in 45 to 60 minutes. The larger lanchas, which may stop at beaches such as Praia Vermelha or Saco do Céu en route, extend the journey to 90 minutes but offer open decks and covered seating. Both vessel types depart from the same pier and arrive at Cais de Abraão, the island's main landing point. Ilha Grande's status as a protected area within the Parque Estadual da Ilha Grande means that no vehicular ferries operate on this route; all transfers are passenger-only. The island has no paved roads and no cars. The 95-BRL Sustainable Tourism Tax, collected per visitor upon entry, funds trail maintenance, waste management, and conservation programs across the island's 193 square kilometers. The fee applies to all arrivals, regardless of the operator or vessel chosen. Weather can disrupt the schedule: during winter cold fronts known as sul winds, typically May through August, operators may consolidate departures or cancel crossings if wave heights exceed two meters in the open channel. Most shared boat transfer Ilha Grande services include pickup coordination from Paraty accommodations, though travelers staying in the historic center usually walk to the pier in under ten minutes. Return journeys from Abraão to Paraty follow a similar schedule, with afternoon departures clustered between 14:00 and 17:00 to accommodate day-trippers and departing overnight guests. Booking a seat on a scheduled speedboat shuttle Paraty Ilha Grande crossing provides guaranteed space during peak periods—December through February and July—when walk-up capacity fills quickly.