Ilha Grande (Portuguese pronunciation: [ˈiʎɐ ˈɡɾɐ̃dʒi] "Big Island") is an island located off the coast of Rio de Janeiro state, Brazil. The island, which is part of the municipality of Angra dos Reis, remains largely undeveloped. For almost a century it was closed by the Brazilian government to free movement or settlement because it first housed a leper colony and then a top-security prison. Cândido Mendes high-security prison housed some of the most dangerous prisoners within the Brazilian penal system. It was closed in 1994. The largest village on the island is called Vila do Abraão with approximately 1900 inhabitants.

The island, which is 193 km² (75 sq mi) in area, is now a popular tourist destination that is noted for its scenic beauty, unspoilt tropical beaches, luxuriant vegetation and rugged landscape. The highest point is the 1,031 m (3,383 ft) Pico da Pedra D'Água. Most of its territory is within the Ilha Grande State Park. The remainder of the island is subject to stringent development restrictions.

Fonte: https://en.wikipedia.org/wiki/Ilha_Grande

Where to Stay?

I Stayed at Cantinho da Vitória Hotel. But you can find more options here:

https://www.tripadvisor.com.br/Tourism-g303497-Ilha_Grande_State_of_Rio_de_Janeiro-Vacations.html

How to get to Ilha Grande and Paraty

The coast road between Rio and Angra dos Reis/Paraty is seriously one of the most beautiful in Brazil, full of bays and mountains and turquoise seas and islands. Definitely a trip worth doing, particularly in good weather. Similarly the boat trip across to Ilha Grande is magnificent. Here are the easiest ways to travel.

GETTING TO ILHA GRANDE (ABRAÃO village) FROM RIO DE JANEIRO

By car: The trip to Ilha Grande from Rio involves getting to Angra dos Reis (2 to 2.5 hours drive southwest of Rio) and then taking a 1—1.5 hour boat across to Ilha Grande. The main port is in Angra dos Reis but there are other options in Mangaratiba and Conceição de Jacarei (see below).

Note : Ilha Grande is traffic free so ask the pousada for the best place to leave the car on the mainland

By bus and boat: Get the Costa Verde bus from the rodoviária (bus station) in Rio to Angra dos Reis and then the boat over to Ilha Grande.You can either buy on-line http://www.costaverdetransportes.com.br or or at Paxtur travel agency on the ground floor of Visconde de Pirajá 303 in Ipanema, tel: +55 21 2523-1000. Buses go regularly between 4am and 9pm; one way R$49,00.

Regualar boats run hourly between Angra dos Reis and Ilha Grande (from 8am to 4pm) – cost R$14,00. http://www.ilhagrande.org/Ilha-Grande/barcas-sa.html
Other types of boat (catamarans or schooners) also run with no set timetables. Cost p.p. between R$15,00 and R$40,00

By van/shared car and boat:
Various companies offer door to door transfers to Ilha Grande which are often cheaper and more convenient than getting bus and boat, particularly if travelling alone.

Green Toad is one of the better options, particularly if you want to pay in advance by credit card. They don’t actually do the transfers themselves but contract out to other companies depending on what time you want to go and where you want to be picked up from. They also do shared Rio airport /Ilha Grande transfers (minimum 3 people). Best to contact them by email info@greentoadbus.com to check what they have available.

Fonte: http://www.hiddenpousadasbrazil.com/brazil-blog/how-to-get-to-ilha-grande-and-paraty/