After this month's trip, double the amount of mosquito coils you think you'll need, extra mantles for the camp lanterns, fly strips - we forgot them one year and the flies in the cabin drove us crazy, extra fishing line in case you get spooled, spare rod and reel, 50' of rope (anchor lines, boat lines, clothes lines etc), golf towel - I put in in the boat to dry my hands, hand creme (no jokes fellas) as I find that having wet hands that are nicked from fish and hooks makes my hands a mess.
That's all I can think of beyond the usual.
One more thing - an extra day of food in case the plane can't get in due to weather.
Also, as per the above post highly recommend Sea Foam!