You can take province ferry which is available 4 days in a week. And it leaves from Male at about 10:00 am. But if you wish to take ferry your flight must land airport latest by 8:30 am, once clear the custom proceed airport to male ferry it's about USD 1 dollar per person and when reached Male. Now you should come to local hulhumale ferry terminal it's on the same area where you have off loaded just pull your bags and buy tickets for Maafushi to Fulidhoo and from Fulidhoo you will be changing domestic ferry to Rakeedhoo its all about is less then USD 12.00 and it takes about 5 hours.
Or if you wish to take your own transfer it's about USD 360.00 per way and it takes about 1 hour some minutes.