I have yet to fish for sailfish and marlins but I have spent many hours fishing in SW Florida. We have a condo on Sanibel Island that we rent weekly so we need to go down twice a year from our home in New England, tocheck things out and yes, do a little (OK a lot) of fishing.
We have friends that are Fl Fishing Guides, so we have the luxury to spend time off Sanibel/Captiva Island fishing for tarpon, snook, trout, redfish, cobia, blacktip sharks, kingfish,etc. It is definitey world calss fishing down there. So different than the fly fishing for trout that I spend most of my time doing here at home.
I think you have been give some good advice from the above replies.
Good luck on your search.....