Rook Island is the main location in Far Cry 3.
You get stranded there and must free your friends who got kidnapped, and then escape.
The island is full of pirates, and you should capture Pirate Outposts to rid areas of pirates and regain the control of the land for the locals
There are two main parts to the island: The North Island and the South Island
The main hub is Amanaki Town where you can rest and get quests.
Methods for getting around include vehicles such as a Motorboat, Jeep, and Hang Glider