We live on the west coast of Fla. as well and use a different option that has worked out for us. We rent a car (usually from Budget). One way rental on each end of the trip. We used to fly out of Fort Lauderdale on Jet Blue, so we would drive over the day before, stay somewhere and drop car at the airport the next morning day of flight. On the return, we would just do the reverse. I'm not sure what it costs for Park N Fly in Mia right now, but Budget has cars for about $100.00 or so for each way right now. This way you don't have to worry about your car being stolen or tampered with. Might be cheaper depending on the cost for the parking for two weeks.