What is the importance of St. Vincent in the novel, About Grace?

St. Vincent is an island in the Caribbean where David flees from Ohio after his dream. It is from St. Vincent that David travels to Cleveland to see about Sandy and Grace. It is in St. Vincent that David has lived for twenty-five years, and has essentially become family with Felix, Soma, and Naaliyah, who live nearby. St. Vincent is where David gets his life together and where he decides to return to the United States after coming to realize his prophetic dreams do not imply an unchangeable future.