Q: Context: Couples Retreat is a 2009 American romantic comedy film directed by Peter Billingsley marking his directorial debut, and written by Jon Favreau, Vince Vaughn, Dana Fox, Curtis Hanson, and Greg Beeman. Vaughn and Favreau star with Jason Bateman, Faizon Love, Kristin Davis, Malin Akerman, Kristen Bell, and Jean Reno. It was released on October 9, 2009, in the United States. The film was shot mostly on the French Polynesian island of Bora Bora.

Question: couples retreat what island was it filmed at?
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To answer this question, we should know that: The film was shot mostly on the French Polynesian island of Bora Bora. So the answer is the French Polynesian island of Bora Bora.