A flight in an Airborne 912 XT trike from Brazoria County airport (LBX) to the San Bernard National Refuge and then south to the south end of Matagorda Island with a landing at Pierce airfield. Foggy day with low ceiling, very low tide with exposed oyster beds in the bay and bayous. A lot of geese and ducks along the way with many pods of dolphins along the beach at the south end of MI.