Whether good or bad, I would spend a lot of energy hiking around. It would take me awhile to believe I landed on an island where humans are neither living nor exploring. After coming to grips with that reality, I would freak out for at least a moment. Then, I'd concentrate on breathing in-and-out for awhile and doing nothing else, until I calmed down. Then, I would do what I've been trained to do and what my intelligence would allow me to improvise.