I might go on a cruise next summer/fall and I will need an electric wheelchair/scooter. I know that a lot of cruise lines are accommodating, but will it be a waste of my money and time? I am able to walk with a walker for a short while (3-5 minutes), so I know a lot of on shore excursions may be out. Are the electric walker/scooter easy to rent for the trip? I don't have one.