Debbie - welcome! You will have a wonderful time on the Diamond. Captain Jeremy is the best! Unfortunately, the staff Captain - Magnus - may still be on vacation.
We spent way too many hours in San Juan airport. Hope it works out for you to store your luggage! And if you didn't get transfers from the ship - don't worry. San Juan may be the EASIEST place to cab it to/from pier. (and only about $20 for however many are in the cab - total!)