Can anyone tell me if the lift / elevators on the Golden Princess have a sill. Would it generally be possible for a person in a wheel-chair to negotiate this on their own, or does it need a helper. I ask this as there will be the odd occasion when my husband will go on shore, while I remain on the ship, and I'm hoping that I will be able to get around on board, on my own? Would as always be gratefull for any information. Sue A.