I used the hotel shuttle service to get to my port, it makes stops at them all. That price was 12.00 per person. Great service, ask the concierge desk to book.
U should be able to go to a walgreens are urgent care near by. I don't think there is a shuttle just stayed last wkend but I parked at the port. Good luck and safe travels
Normally Royal Caribbean Cruise Lines would have a shuttle that will take you to the cruise terminal if they don't you'll be better off if you get an Uber as taxis a very expensive in Miami and they can rip you off when it comes to covid I know that you can get a covid test at Miami International Airport there's two sites I believe one is in the departure and one in the arrival they are pretty expensive I don't know if you're coming from outside the US if you're coming domestic I will suggest for you to do the test in your state
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