Masaki, I think when I speak the language of a port, I am ahead of the game. Don't stress yourself out on planning for this trip. In your profession, you already have enough of it. Save that for when you are in foreign ports where there is just so much you want to do that you need a private driver to get you to the big ones! Get a taxi armed with all the excursion stops from RSSC and get them to take you there. I think I learned this from Ngaire. Often, she will recommend the ship's tours, but usually it is fun to do it yourself.