Hi T bone,
We were not able to fly in a day ahead of time, like you, but you can either get the RCCL transfers or just cab it. If you get the transfers, they will also work on the return trip back to the airport and you can check in your luggage right at the pier before boarding the busses to the airport. Its only about a 20 minute ride to the Miami airport from the pier, so even if you hire a cab, the cost shouldn't be too much. Have Fun!
I did write a review of our recent Explorer cruise in case you want to read through it:
<http://www.cruisemates.com/articles/cruiseguide/shiptour/memreviews/mr_RCI/explorer5.html>
I did notice quite a few more reviews of Explorer, must be a very popular cruise, you'll find out soon enough!
Donna
Tuesday Chat Host