Yes. You will have to pay the daily fee.
you can, they would just charge you the daily per diem while the car was parked since it wouldnt be available for use by other customers. they will pick up the car for free and typically drop off a car for you too at no additional cost though. depending on how long your cruise is, it might be more economical to schedule pick up/ drop offs than pay for a car to sit in a parking lot while you're on your trip.
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