We've been taking cruises out of Ft. Lauderdale whenever we can because of the ParknFly service. I haven't checked recently but I am guessing it will cost you about $90 for a week of parking. You pull into the cruise area of their airport parking lot and within a few minutes the bus will pull up behind your car, they'll load your luggage onto the bus and unload it at the cruise terminal. Check their website - and based on our last trip it is probably a good idea to make a reservation. Beats Miami!
Often wrong - never in doubt!