Have you all considered taking a tour? There are a few companies that will pick you up, take you on a tour and keep your luggage with you throughout the day and then drop you off at a hotel afterwards?
Why not combine a tour with tranfer? Brilliant!
I always refer my customers to Miami Naitve and Wild Lime Adventures...both have outstanding customer service and are permitted to enter the POM.
Ask for John at Miami Native https://miaminativetours.com/
and Ben at Wild Lime https://wildlimeadventures.com/