There are a lot of areas in which fish, I'm sure, have never seen a bait. The marshes are full of fish. Before you venture into any marsh, make sure you have the landowner's permission. Some of it is private and some of it is not. Fishing marshes requires a vastly different approach from fishing beaches.
Fishermen locate redfish by the commotion they make in the shallows.
Redfish get in the shallowest water they can find to feast on crabs and shrimp hiding among the reeds, mud and grass. When they grab bait on the bottom, their tails or back frequently breaks the surface. You are hunting the coves and points. Redfish wait in ambush under cover with their backs up against the grass. They are waiting for something to come across to kill and eat it.