If you can fit in a couple of kites you might get some useable wind at points. I would try to rent a board perhaps even a pump to cut down on luggage room. Rental of kites is still a rare thing in SE Florida at this time. You might get in touch with http://adventuresportsmiami.com
for some ideas in the Miami area. Some sea taxi operations may rent gear and of course kite schools provide it. Have a good trip!