You can click the Island's icon in map mode to move to your new island to start a home, or convert it to a Resort lot. All discovered islands automatically become private lots. When you fill the requirements, you discover one of Isla Paradiso's Uncharted Islands, and it is instantly owned by your Sim's Household. Most of these Islands are good for private homes or Resorts, while others have treasure as a reward for revealing them. With this guide, you'll know all you need in order to find out and see for yourself. On all but one island, sailing up to it is useless and a tooltip simply informs, 'I wonder what's down there'. They're covered in a fog that will bump your camera away if you attempt to zoom in. These are seen in the ocean around Isla Paradiso. Of course there is cheat to discover all islands, but this guide is directed at people who would like to unlock one or all of the hidden islands themselves. You'll have to do a lot of work to unlock them all on a single save file. Each has a requirement to unlock it based on a gameplay feature that comes with the Expansion Pack. The Sims 3 Island Paradise Expansion Pack features a new town, Isla Paradiso, surrounded by eight uncharted islands that can be discovered.
The Sims 3 Island Paradise Expansion Pack The Sims 3 Island Paradise Guide Unlocking Uncharted Islands with Maps and Hints by Carl and Ricalynn