Six Days Seven Nights

Six Days Seven Nights is a 1998 adventurecomedy film, directed by Ivan Reitman and starring Harrison Ford and Anne Heche. The screenplay was written by Michael Browning. It was filmed on location in Kauai, and released on June 12, 1998.

The next morning Robin is called away by her boss to Tahiti to supervise a fashion event. She hires Quinn to fly her there, but a thunderstorm forces them to crashland on a deserted island. Initially believing they are on an island with a peninsula to the north, they climb a mountain to disable a beacon Quinn believes to be there, but discover they are in fact on a different island with no beacon.In Makatea, Frank is told that Robin and Quinn are missing. He and Angelica board a helicopter to search for them but with no success, thus leading Frank to believe that Quinn is dead. One night, Frank gets drunk and sleeps with Angelica after she seduces him. ........

Source: Wikipedia