First off, I've never fished Horn but from what I've read you should go topwater early and then switch to jig or popping cork with a vudu or matrix underneath. If it was me going and I've never been, I'm bring a popping cork and a flow troll bucket tied to me and I'm throwing live shrimp. I've read that the name of the game is fishing relatively early. Heavy boat traffic, especially from pleasure boaters kills that bite. Similar to the cove at Cat Island. The MS barrier islands are beautiful so you'll have a blast regardless. Have fun and report back.

ETA- Shuffle them feet