published by mapstore, the mapa das áreas urbanas do município de angra dos reis, (map of the urban areas of of angra dos reis) shows ilha grande in detail.

published by mapstore, using data from the  the shuttle radar topography mission, the mapa hipsométrico do município de angra dos reis (hypsometric map of angra dos reis), shows terrains in the region.  

the instituto estadual do ambiente - inea publishes on this link a constantly updated report of the quality of the water for some of the main beaches of ilha grande.