Well you might have been better off, renting a car (cheaper??)and taking in the sights.
I cannot tell you the exact loction where you can check your luggage in,in Ft. Lauderdale Airport, but it is in the same terminal where Midwest Airlines is, and you go as far back as you can. (They may have the same check in luggage at the other terminals, but I don't know for sure.)You can also ask one of the workers, and they should be able to tell you this also. Actually $6 a piece isn't bad, considering you don't have to lug it around, especially if it is BIG