Ms., I'm coming in a day earlier and staying at the Palace Hotel, just across the moat from the Imperial Palace. I'm planning to take the airport shuttle bus. It's Y3,000, which currently equals about $27. Supposedly, it takes about 90 minutes. Seems worth it as compared with taxi fares or the RSSC transfer. I gather you're coming in on cruise day. You might consider taking it to a hotel close to the pier, then picking up a taxi from there. I expect there still will be plenty of spa and restaurant reservations left by then, though the Mariner veterans may be able to speak to that better than I.