Yup, this is how it went. We drove to the terminal at 18, dropped our luggage, drove to the Palm Garage near 25, parked, went downstairs and there was a shuttle there waiting for anyone going to 18. The very nice driver took any bags anyone had, we waited like 3 minutes while others boarded and went back to 18. Walked right into the terminal, checked in and right onto the ship. On board by 11:15am.
It just would have been nice to know this. By the way, there ARE sidewalks so it's kind of walkable but unnecessary to do so.