Noone wants to play board games with me and I was wondering if you would need to change the rules at all to play with one player in Forbidden Island
In Forbidden Island, the players have no secrets from each other. There is also no real-time component to the game or other physical limitation that benefit from multiple real players. As such, you can simply play alone by playing with more than one character. Each character has its own hand and plays in turn as if they were played by different people.