The final scene...spoiler

Rating: 9/10 (24 January 2009)

spoiler alert? I really enjoyed this movie. It is amazing to think that Tom Hanks carried such a huge part of the film by himself. There wasn't even much music. during his time on the island, without much dialogue, he was amazing. Not too many actors could pull it off, I think.
In the last scene, after the girl drives off in the pickup with the dog in the back, Tom Hanks stands in the middle of the intersection staring, then the movie cuts away. What is he staring at, and what is he thinking. What did he decide to do? I can't quite figure out what he is thinking. Does he get an "aha" about what direction to take and why? Help!