I think I may hve read this too late!
My wife and I own a condo on Sanibel that we rent weekly but we still try to get down a couple times a year.
We have been going down over 25 yrs, plus my son lived/worked on Sanibel and my daughter did the same on Captiva.
Andyes, we spent a lot of time fishing there in the Gulf of Mexico.
My son worked at the Bait Box on Sanibel and is now a Fly Fishing Guide in Colorado.
We also have friends that are FL fishing guides.
Here's a link to fishing guides on Sanibel and Captiva.
http://sanibelcaptivaislandschamber.chambermaster.com/directory/jsp/busdir/SearchResults.jsp?ccid=341&command=loadCatg&am p;catgid=312&aname=1
Let us know how you did when you return.