Where exactly did Leyton went? And why they didn't say goodbyr to anyone?

Well, I can't deffinitely say where and why, but I think it's a symbolical trip, they don't move anywhere and don't leave, they simply go... And suddenly to Haley and Nathan or Brooke on a visit? We don't know...

if they were going somewhere, moving or what the hell they would at least have their things. they can't just put sawyer in the car and move. it's not that simple