pedra do índio, ilha dos cardos, and pedra de itapuca are protected by the  instituto do patrimônio histórico e artístico nacional - iphan.

pedra do índio can be seen on this wikimapia, ilha dos cardos can be seen on this link, and this page opens a link to a satellite view of pedra de itapuca (labels on map may not match actual denominations).

on this page we listed direct links to a  satellite view of guanabara bay islands - for proper zoom setting pages should be opened using chrome, as other browsers might only display general city views.