GTA San Tiki Islands 2 is a fan-made "total conversion" mod for Grand Theft Auto: San Andreas that replaces the original map with a tropical, island-themed environment. The mod, often hosted on sites like GTA Mod Mafia, features custom assets and requires a clean 2004 PC installation, along with tools like Modloader and CLEO to function properly. For more details on the mod, you can visit community modding sites.