I have found that Nov can be great in GI. Your own private island, as all of the summer crowds are gone. Football and hunting, kids in school, etc. We like the mild weather and like others have said 'watch the weather'. It can be very good. And the redfish bite in the passes is typically very good.
Call Capt Danny Wray at Calmwater Charters. He is a full time resident guide on GI and can make sure you have a great trip.
http://www.calmwatercharters.net/#!f...charters/c24i2
Pic from a crazy topwater red bite around 4 Bayou Pass in November - outgoing tide.