Book called ‘The Island’ author (virus forces people to an island and they have visions)

I can’t find it because I can’t remember the author. It’s been a while so that’s why I’m looking for it.

It’s mainly about a virus and survivors are driven to go to this island. They start to have visions/dreams about a rock formation. (The sequel is called The Rock).

The book is broken up into 5 parts. The first part is this guy getting to his boat and his trip to the island.

I remember it was interesting and I’d like to read it again.