There is a new transfer option from Lucinda to and from Ramsay Bay for the Thorsbourne Trail on Hinchinbrook Island. This removes the dreaded bus / car shuttle back to Cardwell. You can now leave your car at Lucinda for the start (either end) and finish at Lucinda (from either end). Company is Absolute North. Check their web site.
I have no affiliation with this company.
I had already booked a May trip starting Cardwell, finish Lucinda, then bus back to Cardwell. Now to change bookings.