ilha de mana , a 15-acre outcrop shaped like a tortoise shell , is located near the colonial town of paraty .
the private island off the costa verde is three hours by car or 40 minutes by helicopter from rio de janeiro .
at £ 2,500 -lrb- $ 3,750 -rrb- a night , it boasts a main residence and four chalets over crystal clear water .
with stunning surroundings , the island has its own water supply and its buildings are solar powered .