You can rent a scooter as I did for my wife. We rented through Norwegian, I honestly forgot the name of the company ... but the cost was high at $450.00 for 11 days. I brought my own scooter, but we did not have to fly to the port.
I met a very nice couple on the ship (Norwegian "Sun") who had polio and had traveled extensively with his scooter. The airlines MUST transport your scooter at no charge to you as cargo. I will fly from San Francisco to Tampa next month, and yes, my scooter is coming along for the ride!