Some other Grand Isle ideas for you +/-.
If you want to catch finger mullet or pogy there is typically bait rafted up behind the island and I have marked one spot that seems to always have bait if you are good with a cast net. 5 mins from Bridgeside Marina.
On the fishing spots, like guys say 21 ft could be an issue, but do not ignore the near rigs off of GI in 50 to 60 ft of water, or off of Port Fourchon. You can wear your crew out on the Mangroves, Redfish and Lemon Fish within sight of land.
We fish 65 to 80 braid and 30 to 60 lb flouro, depending on how line shy the fish are. Small circle hooks and no weight unless the current is ripping, then only as little weight as necessary. The reds and big white trout are frequently on the bottom though.
We rarely tie to a rig anymore, as we pull up to a rig, then throw some chopped pogy as chum and simultaneously free line the finger mulet or cut pogy and pay out line continuously with the chum ball you just threw. Just slowly drift away with the chum. You will get 'Thumped', Hook up and repeat process. Or tie up to the rig if you prefer.
Run and gun, rig to rig until you get on the fish you want.
Also hit the Fourchon jetties on the channel side or the beach side.
On the inshore stuff, you can fish the reefs behind the island, or up the Barataria waterway around Queen Bess Island, Independence Island Reef, or behind the old fort on the east side of Barataria pass and points east towards 4 Bayou pass.
Bridgeside will have the maps and bait, etc.
Also consider an inshore guide for one day to get the hang (some local knowledge) for that part of your trip.
Good luck.
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